best remote control to customise for my needs?

hi

couldn't think of a better place to put this so:

i have quite a bit of custom kit - philips lcd, onkyo amp, will have a creative zen HTPC with IR (probably) - recording using a tv tuner card.

what i'm looking for is a way to control it all with one unit - maybe a pda or similar? I doubt mainstream controllers will control the kit, esp. the onkyo.

Any suggestiongs for hardware /software?

Feel free to move this mods if you can think of somewhere better...

dgr