GT3076R would be fine man!
not to long ago a dude in perth had his tuned running that turb on a std rb20 with hks cams,plazmaman plenum,6boost mani, turbo smart 48mm gate and all the usual supporting mods and went 358rwhp@20psi... and the way it made the power was so linear and smooth, if i didnt already have the 3040 it definatly would have been my pick!
i cant remember for the life of me what rear housing it was but if you need to know more shoot r32rookie on antilag a pm.