I am running OpenWRT on a Buffalo WBMR-HP-G300H without any issues. This model has an integrated ADSL modem and has a few USB ports. I have a USB hard disk attached and I use it as a media and bittorrent server. Over LAN it can stream an HD movie from the disk, but over wifi it seems too slow for that.
It's kind of annyoing that it comes with DD-WRT preinstalled, but it's half-assed and is not configured for easy modification.
I have not taken the plunge yet, because I do not want to deal with jtag cables if it bricks, and the whole "install our binary, and then do not even breathe in the direction of the router for 10 minutes" part does not inspire much confidence...
