The GT28 is a great turbo and spools and makes good power, it will run 20psi but it will be out of its effeciency range and i would sugest a turbo change if you are going to be running 20psi as you will make more power in the long run.
try looking at something along the lines as a GT2871R it will have no problems running 20psi as its right in its effeciency range and one with a .86 rear will be little bit laggyer but the hondas high reving nature will more than make up for it.
as the for SR20 my mates running 21psi through his with a massive turbo kit making 386hp ona a stock motor and tomei metal head gasket.
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