Spec Focus, Spec Neon, Spec E30 and Spec 944 all have similar lap times one is not significantly faster than the other, you can throw spec miata in there to. I’m sure one is faster than the other but based on my experience they are pretty similar overall.
Spec Focus & Spec neon. I would skip these if you want a lot of competition, I don’t see them growing very significantly. Although Spec E30 has small numbers in OH/IN, (I was the only one at Grattan and we had 4 at mid ohio), I see there being a much bigger upside to the numbers. The mid-atlantic and south east have very strong spec E30 regions. They get 10-25 cars at their races. Of course you have nationals at Mid Ohio so that is great. They are also front wheel drive if you like that sort of thing
CMC – don’t know much about it seems like a good class if you like American muscle cars.
944 spec – very similar to Spec E30 in kind of car and numbers. There is a good thread about the potential differences here
http://spece30.com/component/option,com_mamboboard/Itemid,/func,view/catid,16/id,15084/#15084
GTS – this is a very simple class with simple rules which makes it attractive. The one drawback I have is that there it is too simple almost with no real cap on development. Right now it is still in its infancy so everyone is happy but there is a lot of room for development of cars as long as it stays kinda grassroots and you don’t get someone spending a ton of money on developing the ultimate GTS car it will be a good series. But there is always the potential
I’m a BMW guy so it was a pretty easy decision for me to race Spec E30. I can tell you that so far it has been very reliable (as I expected based on my E30 M3 that I raced for 5 years) and fun to drive.
To see video go to Google video and do a search on Spec E30
http://video.google.com/videosearch?q=spec+e30&num=10&so=0&start=10
I have video of Grattan and Mid Ohio on there, 2 tracks that you know. My Grattan is not the best, I’ll use the first time there excuse :). I’ll email you offline about hooking up to try the car out for a session or 2. I understand you got bit last time you bought a T2 car but honestly you will love the way a spec E30 drives, ask anyone on this list, oh and the stock brakes work fine