I'd agree the non turbo coupe's are probably cheaper full stop. not so heavy on the juice, No turbo, intercooler etc and all that extra heat creating problems. The 16V N/A is by no means a fast car, I think its 9 secs to 60, but hey if you wanted to go fast you would buy a turbo so thats' not the point.
If you can afford it, go for the 20V engine it sounds sooo good and it's a bit better on the juice, as well as being faster.