My neighbor has a GXP (works for a Pontiac Dealer...go figure). I absolutely love the car. It'* black, I love the interior, the exterior is very nice, especially in black (the red, and 'mother-of-pearl" white is gorgeous too). Some minor improvements can be done to the exterior, but I do like the refined edges overall.
The exhaust sounds great, on start-up too. I could hear my neighbor turn it on from down the street, I turned my head at the sound. I think there'* one more GXP still at the dealer...if I can't get a test-drive with that, I'll try to beg my neighbor to let me drive his.
I will still try to find a 2003 SSEi some day, but I would be completely happy with a GXP.