NO, the b16 in a DA is not a good choice not in his situation.
Since he already has everything else a b20 would be a good decision, it will be faster than a b16 and has plenty of aftermarket support. It's the same as an LS with an 84mm bore. I think the b20z has a little more HP but it's a minimal difference.
If you were going to get the b18b/a then I'd suggest getting it from somewhere else than hmotors, i'm not knocking them, they're excellent but you can find one cheaper. I got a complete 91 LS swap for 400 and a complete 95 longblock for 275, and an extra 2000 longblock for 200.
Check ebay, try to get a local one though.
If I were in your little predicament, I would get another LS and peice a turbo kit together.