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I've had a Sparco Evo for a couple of years. It only works with a harness, but it's comfortable enough to sit in everyday, and for hundreds and hundreds of miles at a time.
I recommend doing a "test fit" before ordering the seat to make sure it fits you well. I went to OG Racing (http://www.ogracing.com/ out in Sterling, VA where they have every seat Sparco makes in a show room.
BTW, I spoke to you several months ago about H/C mods to my '03 Z06 and I was going to stop by and feel/hear some examples. Time got away from me; I'll have to get back on track. Let me know if you have any people that you've done in the area (I live in Arlington, VA) that wouldn't mind driving me in their car.