hey mate great build, will be interesting to see how it turns out, with your turbo mate.. i found that the dsr430 turbo was a great upgrade.
http://www.nissansilvia.com/forums/index.php?showtopic=467536&st=0&p=5991023entry5991023
(link to my old skyline i sold a while back that i put the turbo on, if you want the spec/pic of it..)
it didnt cost me a hole lot either, boost comes on quick an stong considering its only a rb20
cheers bud keep up the good work