Your best choice for a SA Auto, would be the SIG P-210. A wonderful gun in 9mm. Pricey, though. ($800-$1000 used, $1300-$2000 new.)
A next-best bet would be a S&W Model 52 (in .38 special only), which is a wonderful SA. These run from $500-$800 depending on condition.
I have one of each, and they're both joys to shoot. And exceptionally accurate. The Model 52 has the best trigger I've every used.
Then you could look at several revolvers. I had (sold recently) a S&W Model 25-2 with 6 1/2 inch barrel (.45 acp) Very accurate. I also have a 6" Python that is comparably accurate.
Then there are a 1911's in various calibers. Most Bullseye shooters use 1911s for the higher calibers. They also use a variety of guns for the smaller calibers. Bullseye guns are by far the most accurate.
A 1911 in 38 super or 9mm might be interesting. I find my CZ-75, however, to be very accurate,and the trigger pull can be lightened (in SA mode) to match any of the guns mentioned, above. I keep the trigger a little (4-5 lbs) on the heavy side for IDPA competition.
[This message has been edited by Walt Sherrill (edited February 04, 2000).]