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I'd go BNR's or GT35r. I have BNR's and plan on making around 400seq. with my new engine. I had around 370 in my last engine before a coolant seal went. BNR's are going to be cheaper. And if you remove all the emissions junk twins are pretty each to work on. A negative is they are probably going to produce more heat than a single, and a single is very easy to work because there is only 3-4 vac. hoses vs. 8-10 with the simplified seq.
From my experience at high boost seq. you really aren't going to make a lot of power at low rpms just do to the flow of of the single twin, but you will make some which is probably more than most singles. Ideally you probably need to stay at least above 4k to have much, which is alot like a single. I counteracted most of this on the AutoX course just by getting on the gas sooner, or if you can/do left foot brake(I didn't) that should help.
If right now I had to change turbo's for some reason I'd go single, but I am very happy with the BNR's and will keep them until they either die, or someone gives me a single for free. After 10-20k hard miles with boost up to 18psi on them they have held up great.
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