I too love the Buffalo routers, unfortunately due to patent issues Buffalo has been issued an injunction from selling routers in the US (more here). When I saw the release I snarfed up 5 WHR-G125s from multiple Circuit City stores for use with dd-wrt. This patent issue may spill over to eventually affect the larger manufacturers like Linksys, Netgear, and D-Link but I digress.

One of the side benefits of dd-wrt is that it can make your stock wireless box into a repeater, bridged repeater, client, or a bridged client along with an AP. You'd have to get a second router but it's really flexible for extending range. Put it in repeater mode at some high spot in the house. I currently use a second router to act as a bridged client for my Slingbox.

Couple of other benefits is that for no additional cost you can add a bunch of functionality. I've got mine set up as an OpenVPN server for when I'm playing roadwarrior, Dynamic DNS client so when my ISP changes my addy the router will automatically reset a 'follow me home' domain, PPtP server so I can VPN in with my ipod Touch, as well as a Wake-on-Lan client so I can power up my home machine from the road and remote access my desktop.