Ryan,
If it were me looking for wheels again, i'd be looking at the widths and weights.
Get a width you want...then look at the weights.
If you are giving it some track work...i'd be looking at the best (strongest, best designed, best engineered, lightest alloys used) wheels you can get...to make sure the things are both lighter than stock, and stronger.
This leads you straight to BBS for one...
I'd look at the weight of the others - Sportec, MTM etc...and the design.
Cross spokes are accepted as the strongest design of wheel possible for a given amount of metal used in the manufacture...that's just the way it is...so, you either fit decent cross spokes, or you sacrafice either weight or strength. That's my interpretation of what I've found, anyway...
Fat spokes tend to weigh heavy...I'd be keen to hear how much the Sportecs and MTMs weight...although I believe Sportec use some fairly exotic alloys to keep the weight down.
There are other options...OZ Superlagerra (sp?) are light...but that thin spoke design has it's strength limitations....the S3 is a heavy car...and it's dealing with high torque loadings...so i'd be wary of those designs for heavy track use (bearing in mind that you aren't a race team who can afford to 'life' their wheels and bin them after a few races)
This is a Japanese Spec Integra type R wheel:
Made my Enkai, very light (approx 14 lbs per 7" x 16" wheel).
The ITR is fairly light (1100 Kgs) and doesn't have high torque...
This is the same wheel after a bit of abuse:
I'd be wary of uber lightweight 'racing' wheels for road use...or aggressive (read 'kerb bouncing') track use.
Strength vs weight...that's the bit to look at.
And for that reason, I'd not run cheap replicas...as they are heavier and weaker than the originals...
Also, if you are serious about saving weight...single piece wheels are almost always lighter than 2 or 3 piece wheels...of a similar design.
So, a BBR RC will be lighter than an RSII...and an RX will be lighter than a RXII...
Although, with BBS using titanium bolts to join the two halves, the difference isn't always that much..
8.9" x 18" BBS RSIIs are lighter than the standard 7.5" x 17" Ronal made S3 wheels...not by much (approx 1lb or less) but they are lighter, as well as wider and 1" larger diameter.
I imagine 18" RCs would be a fair bit lighter...