Wanna come down to DC? :-)
For most purposes, I find Splashtop Remote (simpler version of Whiteboard - just control, no annotations) to be fine. I had some initial bugs with Whiteboard, but the people at Splashtop were very helpful - and when I finally restored my iPad to factory settings and recreated it (I had some problems installing the 5.0.1 update, and until I did the restore my iPad was moody) it's been fine.
There has been some discussion on the iPad educator's ning about using Apple TV's with projectors - right now that seems to be the best solution, but problems are that a) most projectors can't take the Apple TV, requiring adaptors (and it doesn't seem clear if those work), b) installation (you need an additional ceiling power source - most have it with the projector, but it's one other factor), and c) passwords (too easy to get on someone else's Apple TV). But the ones that do have it working seem happy with it... I'm hoping to be able to try it with a pilot teacher next year.