the nice part about running a return line is the fact that you an run lower fuel pressure at idle/while in vac and build pressure as you build boost. it helps with tuning on larger injectors with the stock or stage 1 pcm
stage 2 injectors would be easier to install, but you'll run much richer at idle (and all around if you dont tune for them) and probably see fuel economy suffer as well.
my vote is for the returnline.
HOWEVER...with the diablo you may be able to get a little more fuel out of the stock injectors and dial back fuel if you wen stage 2 injectors.
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