I don't really have the time to address this properly right now so I'll just ignore the Nader propaganda...
Paige, Any model not including 1960 is a fine pick. Earlies (1960-1964) are more ummm.... bathtub looking than lates (1965-1969). Pricing will run the same either way. The sweet spot for Corvair production overall was 1966-67. The best of the development was had by 67 without the eventual slacker attitude in construction for the last 2 years. I would not buy a turbo charged car unless I was prepared to go full blown crazy into the art of Corvair tuning. Given todays highway speeds, the best powertrain combo is a 102hp (or 110 in '64)/3.27 rear end ratio/4speed car in the earlies, 110hp/3.27 ratio/4 speed in the lates. 140hp engines are a bit faster, but you are looking at 4 carbs to adjust rather than 2, which can be a bit daunting to master. Avoid the powerglide cars like the black plague. (unless you enjoy driving underpowered 2 speed automatics) The PG was just a huge HP robber.
The perfect pick for a Vair enthusiast: 1966 Corsa Coupe. 140hp, 4 speed, 3.27 posi. 205/60/15's will fit these cars without modifications on Monte Carlo steelies and give a bit more highway cruising speed. I prefer to run larger tires with lower profiles, but the wheel wells need mods. I have a 67,000 mile car that matches these characteristics, waiting for a rebuild right now.
If you just have to have an early: 1964 Monza Coupe. 110hp, 4 speed, 3.27. The '63s aren't a bad pick either.
In either case a Convertible is fun and plentiful. The big ticket items on the verts are the window seals around the side glass. A car with good seals will save you about $500.
If you are looking for an almost rust free project, you are going to have a hard time locating one in MO. These cars will rust at the cowl, rockers, front and rear fenders behind the wheels, and under the battery tray. Convertibles will have floor rot in most cases. Pretty easy to fix rot on these, and panels are available.
Check out Clarks Corvairs for a lot of info and parts. and Corsa.org for more info.