Stock for stock, a 4-door Integra gsr will be faster than a 2-door integra LS. Handling is also up in the air, as the longer wheelbase of the 4-door is rumored to make the car better balanced.
I would take a 4-door gsr over a 2-door LS. 4-door gsr's are also pretty rare, so you have that factor going for ya also :thumbup:
Insurance rates should be lower for the sedan, although the 170-hp vtec motor might bump it up to around the same level as a 2-door LS. I'm not entirely sure though...