If you have 3 g's to spend.... what would you do with it? put it towards the D and have a NICE turbo setup that can easily outrun an SI with I/H/E... the choice is yours...
sure the B series respond well to minor bolt ons but in the end that's all you've got...minor bolt ons... whereas the D may barely gain anythin' out of I/H/E but if you go the proper route (turbo) then you have nearly limitless potential out of the D!
Now i know that you "B People" are gonna start arguin' that.. 'well if turbo the b then my b is faster than your d...' Yes, your right but at what expense, in the end you'll have a faster car but also you would have spent more money....
If you have alot of budget then go build up a B, no one is stoppin' you but for me, i already have a great engine that is running strong and im not about to waste it for an extra camshaft.
And if you have a really big budget then buy an EVO or somethin'..