Italian exotics, specifically Ferraris, have a consistent history of increasing in value over the years. If you can afford to buy into one, then sit tight and let the market do its thing. You'll know when the time is right to sell. But Ferraris aren't the only cars whose values appreciate. Lamborghinis also have a solid history of earning great returns for investors, and this 2000 Lamborghini Diablo GTR is a prime example.

It'll be up for auction next month at RM Auction's Monterey event at Pebble Beach and, in our opinion, it estimated price range of $580,000 to $780,000 is damn reasonable. This Diablo GTR is just one of 30 examples built, specifically build number 19. For those who don't know, the Diablo GTR was the track-only variant of the limited production Diablo GT, and this one has a racing history. Because it's competition-spec, it's been fitted with a fully integrated roll cage and a rear wing bolted directly onto the frame (additional aerodynamics and downforce come in handy when spinning around a track). Its interior is fully stripped, and its body is made entirely of carbon fiber, only exceptions being the metal doors that provide rigidity and safety.

Even the windows are Plexiglas. During its time, the Diablo GTR was the best-handling car Lamborghini had ever built. Power came courtesy of a 6.0-liter V12 with 590 hp, 40 ponies more than the Diablo SVR. And yes, this was the most powerful engine Lamborghini had ever built up until this point. With the combined upgrades and the engine, top speed was clocked at 210 mph. Diablo GTR #19 raced for the entire run of the Supertrophy series, and was owned by a number of racing teams. From 2012 until 2013, it underwent a complete ground-up restoration which saw it returned to its original condition (and orange paint).

This Lamborghini's value will only increase through the years, not only because it's a rare Diablo, but also for being one of the first factory-backed racing cars. Photos courtesy of RM Auctions.