i had some seat time in a Birkin a few hours before i sat in the SV i would buy. the birkin was a s3 sized car, and had a stero + speakers and other little bits that couldbe nice.
the SV is plenty spacious. i'm not a big guy, but having also been in an actual s3, its nice to actually hav a little space to sort of rest ur left foot. my SV becomes an almost daily drive when the weather warms up, so reliability is a critcial issue.
as much as i find pleasure in working on my cars, driving the 7 gives way more pleasure!
coming to 7-7-07 will allow u to expirience all the different drivetrains and how they deliver power. that will be an immense help in deciding how much power u need and when it occurs. do deide on a v8, v6, 4 cylinder, FI(like skip) or a bike engine.
personally, the duratec is becoming an excellent lightweight tuned engine. and i see caterham is now offing the 6 speed in a touring designation. that probably has an overdriven gear.