What am I looking at?

I'm trying to decide between an LD340 (one on eBay for a pretty decent price right now) versus the air-gap. The air-gap doesn't have the exhaust crossover and it does get cold around here in the winter. However, I never drive the car in the cold and I wouldn't do anything but fire it up for a little tuning unless it's above 55 or 60. Am I really going to need the crossover for the way I drive it? Or is it only really needed for daily-drivers when you need to drive it in the cold? Don't really know if "cold" means freezing, or just not warm out.