While there are some early C1 Corvettes out there that are exceedingly rare and prohibitively expensive, there are plenty of first-generation Corvettes - especially those between 1959 and 1961 - that are well within the range of most budgets.
Despite its popularity, the second-gen Corvette holds the record for the fewest number of production years of any generation Corvette. The most valuable examples of the C2 Corvette live sort of like "bookends" at the start and finish of second-gen production.
The C3 still holds the record for the longest production run of any generation Corvette. It was the generation that saw the Corvette "grow-up" from being a powerful track car and Le Mans racer to an iconic sports car synonymous with the American Dream.
The early C4's had their problems, what with the 1984 Cross-Fire Injection and its unusual 4+3 manual transmission. By the late 1980's, the fourth-generation Corvette had evolved into a more desirable automobile, thanks in part to the arrival of the ZR-1.
Built from 1997 until 2004, the C5 Corvette is considered one of the most reliable. Given its increasing affordability, the C5 offers a lot of power and performance at great value. How its maintained and cared for can dramatically affect the overall quality.
The C6 is truly a track-capable beast that offers incredible power at an affordable price. When developing the sixth-generation Corvette, Chevrolet adopted the mantra, "If it ain't broke, don't fix it." For all intents and purposes, it was an evolution of the C5.
You can find a newer, low-mileage, Corvette at a price point that is reasonable when looking at a C7 vs the competition. You'll pay more than you would for a Mustang, Challenger or Camaro, but you'll get a lot more car for the money too.