Hi Mitch,
I bought the VIS internals on black friday - Haven't fitted them yet so can't comment on quality - But they're cracking value at 200-230 pounds.
I bough a Peron inter-cooler for over 600 pounds and looking at it I definitely think it's overkill unless you've a whopper turbo.
If i was doing it again i'd go with the Darkside S3 Clone or an original S3 second hand. Good luck with it all.