When should I get my turbo?

So would a normal T4 be better suited then? or am I talking crap? I assume the lag would be greater cos of the longer spool up times but there are ways to reduce turbo lag aren't there?

That 300bhp figure is kind of my long term goal, in the medium term i'm looking for anything around 250-260 so would this be achievable with a T4 on reasonably low boost (like 7 or 8 psi?)

thanks again