2.4GHz is worse than worthless in my apartment. I can see ten different WLANs right now from my laptop (none of them are mine), and there are phones, baby monitors and microwaves to contend with on top of that.
Historically, I've prefered 5GHz A equipment, but A equipment is very hard to come by.
Supposedly, a huge feature of N is that just obliterates anything else on 2.4GHz equipment on the same channel. That, and massive, massive range. I have some hope that "draft N" equipment will support upgrade to "N" when it becomes available, though. Draft N has been around for... 18 months now? A long time, but worst case scenario, I end up with an expensive 802.11G router.