After asking on #radeon, this is what I got:
<adamk> patcito: The HD5xxx cards support 2D modesetting only with radeon. No 2D or 3D acceleration.
<adamk> That will hopefully change shortly, but there is no timetable.
<adamk> The HD4xxx cards support really good 2D acceleration. 3D works, but is not great. It’s actively being worked on though.
<adamk> The r600 gallium driver is actively being worked on, but your guess is as good as mine as to how capable it will be when it’s done.
<adamk> The classic mesa driver is certainly capable of running ut2004 prett well, and even doom3 on some light settings.
So I think I’ll probably go with an HD4xxx as I don’t want to mess with proprietary drivers.
Spike Burch
