With a budget of $20,000 or less, there are several nicely used Audi models you can buy today.

There are a lot of Audis you can find for under $20,000, and if you're lucky enough, you can find a classic/iconic Audi that's around that price.

Audi has made some unique and unforgettable cars on the planet. The company has a colorful history from its origins in Germany, where car production began on a small scale.

Audi has since created cars that have captured people's eyes, including models like the Audi R8 that came out of nowhere to wow supercar fans everywhere. Some of these legendary vehicles have become collector's items, which means they are really expensive.

But all hope is not lost because some vehicles have become affordable. After all, their market value has reduced throughout the years. One can find some of the most remarkable cars in the Audi lineup for under $20,000.

Let's take a look at the best Audi's that are under $20k.

RELATED: Here's What We Love About The 2018 Audi A4

The 2008 Audi TT has a different look than its previous models. It has a more crisply styled sheet metal for a more masculine outer stance, a revamped interior, and performance that matches its fashion statement.

The TT is available as a coupe or as a roadster. It comes in two different models: a turbocharged four-cylinder model with front-wheel drive and a V-6 model with Quattro all-wheel drive.

The turbocharged 2.0-liter four-cylinder engine in the front-wheel-drive 2.0T model produces 200 horsepower and 207 pound-feet of torque. The all-wheel-drive V-6 model produces 250 horsepower and 236 lb-ft of torque. A paddle-shift automated manual transmission is standard on the 2.0T. The 3.2 Quattro is available with either a six-speed manual or a six-speed S-Tronic transmission.

The 2008 Audi TT drives substantially better and is much more responsive than the previous generation. Ride quality has also increased, thanks to the new magnetic ride dampers. The new steering rack may lack feel for certain drivers, but there's no doubting its sharpness. It's a fast car that can handle wet weather well.

Audi sold 4,486 units of the TT in 2008; this was a good year for the TT because no other year sold this amount of units. As you can see this was one of the best cars made in 2008, and the car is really reliable. What's more, there weren't a lot of complaints about the vehicle. The TT's price is around $8,554 to $11,604.

The RS6 is an underrated super sedan; the 4.2-liter twin-turbo V8 under the hood produces more horsepower than the M5, and the RS6 has Audi's Quattro all-wheel-drive system.

The 4.2-liter twin-turbocharged V8 produces 444 horsepower and 428 pound-feet of torque. The RS6 can go from 0 to 60 mph in 4.6 seconds and reach a high speed of 155 mph, though some owners say its top speed is around 167 mph.

Audi's Quattro AWD system, which includes an active center differential, is standard on every C5 RS6. It comes with a five-speed automatic transmission. The RS6 is safe and enjoyable to drive, but it also allows you to have some fun, particularly if you disengage the stability control.

The C5 comes fully loaded with a navigation system, dual-zone climate control, heated seats, cruise control, HID headlights, front and rear parking sensors, and other features.

The market for the C5 RS6 has been relatively stable throughout the years, with Audi selling 1200 units of the C5. The C5 RS6 has a market value of roughly $18,000, with the lowest price being $7,000.

The C5 RS6 is a terrific old-school performance sedan that will turn heads while still giving an excellent driving experience and affordable luxury.

RELATED: How The Audi A6 Emerged The Most Luxurious Sedan In 2014

A 4.2-liter V8 engine drives the Audi RS 4. This monster produces 420 horsepower and 317 pound-feet of torque thanks to direct fuel injection and a 12.5:1 compression ratio. Audi's Quattro all-wheel-drive technology provides power to all four wheels via a six-speed manual transmission. The RS can accelerate from 0 to 60 mph in 4.7 seconds.

Thanks to the 400 horsepower and all-wheel-drive grip, the RS 4 has no problem catapulting itself off the line or out of a corner. Apart from its remarkable acceleration, the RS 4 also excels in the braking and handling aspects.

Despite its heavy curb weight, the RS 4 remains composed in the curves. The front tires provide excellent confidence and grip, the balance is strong, and the steering feel at speed is superior to that of most automobiles.

Its safety features are not bad; it has stability control, antilock brakes with brake assist, front seat-mounted side airbags, and full-length head curtain airbags. The 2007 RS 4 is part of the second generation Audi RS 4, and during this generation, Audi sold a total of 10,000 units. Its price is around $9,891 to $14,442.

Marcus is a car enthusiast who loves writing about them. He travels frequently and always seeks out the best driving roads to really test a car's limits. His favorite cars are anything with a manual transmission, and he's been known to spend hours just shifting through all the gears.