Dave,
You already know how I feel about the 40GT. Mine is extremely accurate and fast, but it would be interesting to see which one you prefer if you buy a 38 Super. I think in the USPSA arena, more is better, with everything else being equal. As far as plates go, I can hold my own against the 38 Supers and 9mm here in the Cinci area. But at 57, time is running out.