When I was at KOH this year I checked out the Alpha. I'm about the same size as you (5'11", 225, waist ~ 36-38) and the Alpha Extra Wide fit much better than the regular width Alpha. I don't have any first hand experience actually riding in them. I sat in the Podium as well. I don't remember whether it was a normal or extra wide version, and I think it felt okay, but I think the Alpha was going to be my first pick of PRP - although I have the same questions you do about whether it would actually fit in the Jeep.
I have also been looking at Sparco. My buddy has some in his 4600 class TJ, but I haven't gotten a chance to sit in them and I'm not sure which model. Being on the right coast, there isn't a lot of opportunities to check out how the different seats "fit" myself (1) or the Jeep (2). I do think I am trending towards a hard shell vs. suspension seat.
Will be interested to see what you end up with and how they fit. Definitely trying to avoid the "I bought these new seats and they don't fit" trap