I considered the ZR1, R8, 430, Murci, Gallardo. Disclaimer: I did not have the opportunity to drive any of these first, and all of this is my opinion.
The ZR1 was intruiging, but not exotic. Not special, I see 50 vettes a day.
R8 and Gallardo (and 360) don't do it for me in the looks department, they look feminine to my eye. Plus in hindsight, the '05-'06 Gallardos seem to be selling for the same amount less than GTs now than the asking price was more in '07-'08.
Murci got crossed off because of upfront and maint costs and I hate flappy paddle gearboxes. I added ~100hp to my GT in an afternoon for $600 in my garage, a mod that would not void the warranty if I had one (FRPP pulley/tune).
I don't mind saying that the Lambo and Ferrari forums were a turn-off also. There are wonderful and informative folks on each, but it seems they are competing with other types, you won't find that here.
I've owned my GT for 4 1/2 years, put 17K miles on it and could sell it nearly for what I bought it for. It is part of the family now and will never leave, I don't think like that about cars usually. My kids hand out toy GTs to the kids in the crowds that gather around it (and there will be crowds). EVERYONE who sees it smiles and seems comfortable to engage me about it, fair or not the FCar guys don't always receive that kind of acceptance around here. My GT is almost 8 years old and is still relevant (in performance and the intangibles), 'why would you consider another car?' is the question.