For me, the 996 was the most desirable. I wasn't really into the air cooled and fell in love with the 996 GT2 after seeing its reliability on the early 2000s gumball with Lonman abusing his all over. I've seen turbo 996 for sale, but the GT2 are rarer. Neighbour has a 997 GT2 and 996 GT3 cs, so it just swayed me after chatting.
Yeah, I love the aggressive look of the GT2!
All those variants you've mentioned have the advantage of being the mid-model refresh of the 996: namely, the elimination of the fried egg-headlights and the wide-body vs slab-side of the 996.1. That started with the introduction of the 996 Turbo and subsequent variants were much more well-received by owners and collectors.
After the 996.1 headlight debacle, Porsche never forked around with the round headlight design of the 911 ever again.