That Si blue is awesome. Good choice IMO.
I think 400 might be a tad bit high, of course I'm not being a naysayer, and I understand that a high goal might mean a good result even if you come a little bit short.
I just wanted to throw that out there.
The Si is a totally upgradable car, but if you plan on going nuts with engine swaps and fully boostable internals anyway, there are lighter cars out there.
But then agian we come back to the blue.....
Such is life I guess. Good luck and welcome teh HAN.
Post pics if you get the Si.