There is an "S" model. You may have read something wrong above, but the "S" model is a real thing. It's got a 16 valve engine as opposed to the 8 valve most n/a's have. It has something like 175 hp if memory serves me right. However, the common consensus is that it is not worth it because the parts are harder to find and it has an issue with a timing chain as opposed to a timing belt. There is also an S2 model. It again has the 16 valves. This one has 225 hp or so. It is considered more reliable than the turbo, but again has parts issues as well as not being easily upgraded like the turbo.
-Tim