These kind of posts always end this way. It's almost always pointless as the only thing that really matters is what Nath wants in a car and most of you don't know him well enough.
The reason the CRZ has been such a good car is that it ticks 3 very important boxes for Nath.
1 - It's different and looks very cool.
2 - It's very economical (fuel, road tax, insurance).
3 - It's utterly reliable.
It's actually much more than that because it's quite nippy and comfortable too. It's an excellent package.
Nearly everything suggested in this thread fails at least one of those tests and quite a few are not comfortable at all. Take the GT86 for example. I was seriously thinking of buying one of these cars as a daily runaround and was so disappointed with the way it drove. Put it on a track with double the power and it makes sense, but on the road with a peaky engine, hard suspension and cheap interior finish and it's a disaster.
An S2000 would be even more ridiculous. Whilst I appreciate the cult following of this car it doesn't stack up at all to Nath's requirements at all.