What are you trying to do with the car? Are you going for all out power, or a more responsive setup? This is going to determine the turbos you are going to use. You say you want to run 30 psi so you can pretty much rule out using stock RB,VG or SR turbos. If your looking for something responsive than you should look into something like a pair of the smaller GT28's. Problem is, as far as I know they only come in T25 flange. You might be able to find them in T3 flange but I haven't. AFAIK the only GT28's that come in a T3 flange are the disco potatoes and they could end up being a little laggy. If lag is not so much of an issue than I would say go with the discos. Just my 2 cents.
Brandon