I'm using a pre-n router now from Belkin. It did increase my range considerably over my previous dlink b/g router. When I got my laptop 18 months ago, I had a dell draft n wireless card installed and although I was assured it would work with the Belkin, and if not, it would fall back to b/g, it wouldn't connect even if I was on top of the router. I tried a switch out for the same wireless card and it behaved the same. I "downgraded" to an intel-pro 3945b/g card and all is good. It works flawlessly around the house and out as far as 3 of our 5 cabins.
The problem is, in 2 of the 3 cabins that MY computer works in, perhaps 1 in 10 of our guests' computers have connectivity. I'm sure that once the N standard gets ratified and all new laptops ship with it, it'll be the way to go. For now, however, it's just not practical for my application.
That's why I think that an outdoor AP with b/g will be best for me right now. If, for a small cost of $150-$250, I can provide reliable wireless to all of the cabins, it's a huge added benefit to our guests.