Max C, it all sounds exciting!
I don't know if you will need a descaler as I haven't worked with LCD projectors whatsoever other than to display PowerPoint presentations from laptops.
However, I can tell you that one thing I always look for in an input device (keyboard, mouse, joystick gamepad, etc.) is that it be wireless because I sit across the room from the HTPC, of course.
First of all, I loathe trackballs. I strongly prefer a keyboard & mouse over other devices when it come to First-Person Shooters like Unreal Tournament 2003, GTA: Vice City, NOLF, NOLF2, and Half-Life. I am very happy with my Gyration Suite (keyboard and mouse)
. I recently swapped out the regular AAA batts on the keyboard with some excellent rechargeables too. You can read more on that and my experiences with the Gyration Suite here
Gyration now has a larger full-size keyboard suite
, but I prefer my standard "compact" one because it takes up far less space on my lap desk. After all, all you really need it the WASD keys and the spacebar, right? And the response has been lightning quick. I don't notice any lag at all when playing UT2003 online using this wireless combo.
As for other gaming input devices, I have not seen a wireless steering wheel as of yet, but I recently discovered a "Kick-Ass" (as Maximum PC calls it) wireless gamepad. It's the Saitek P3000 Wireless Game Pad
. Check this thing out. It comes with TWO Ni-Mh batteries. That way one is always charged up and ready to go.
I was seriously looking into the now-discontinued $120 Logitech Momo Force racing wheel
. But as much as I want a wheel for my racing games, they are tend to be too cumbersome and require me to set up a TV tray or likewise in front of me to bolt it onto. Plus there are wires strung everywhere. I just might get this wireless gamepad for instead and save $80 over the Logitech wheel.
I checked out a display model recently at a local CompUSA and I liked the feel. The light gray parts of the handles shown in in the photo are rubber, not plastic, so it has a really good grip and feel (better than my PlayStation controllers ever did).
Hope this info helps!