tercel drifter wrote: but i say a stock sr20 can easily handle 30psi with a T66
You're dreaming bud. Methinks you shouldn't be calling the OP uninformed with posts like that.
To answer the original question, different turbos will be best for the SR in different situations. Until you decide what you want from the SR you'd be better off researching turbos and looking at their compressor maps. You want a turbo that operates in it's highest efficiency but not above it to raise your intake temps too high.