Yeah, SC61 - /31/52 with a 0.82 back is a good choice. Makes 500hp easily at 18psi - 20psi.
But it´s a little bit laggy. Almost no power under 4500rpm but great topend for 600hp - 620hp.
SC6262 is my favorite and next choice, good for 650hp - 700hp.
I think a GT3071R or GT3076R T3 makes responsive 500hp with a good mani, exhaust and tune. "Full-boost" ~ 4200, with a good exhaust and tune a little bit lower. A friend of mine love this turbo on his 200sx. Me too.
As far as I can tell a 2871R 56ar 0.86 back T2 chokes the engine above 450hp and over 7000rpms. But great midrange power, starts to boost at ~3300rpm and holds the power ~ 6800 - 7000rpm.
If you go the T2 route, take a GT3076R-WG 0.86 a/r (biggest T2 internal wastegated) with a ported GTI-R mani. This turbo has a bit more topend then the 2871, but you must weld or buy a really good exhaust for low backpressure.
GT28RS disco potato is out of the question for 450hp.
T3 and T4s = old technology, but better then most people think.