Define reasonably priced!
I think a raffle would be the most fair and might also attract a few new faces (whether they stick around or not is another matter, of course). The first giveaway was quite fun--I don't know if you could do that again and offer more entries for certain actions, but I'd love to see something like that again. It was a great way to get folks involved on the forum.
As for prizes...hm. I'm not sure what reasonably priced means, but here are a few somewhat lower budget ideas (guessing cameras and lenses are not in budget):
An awesome camera bag
Good solid tripod legs (maybe a head too if it's not too pricey) Gitzo or Induro?
Wemberley gimbal head
Choice of class on CreativeLive.com
Maybe just a gift card to B&H ( though I know that's not convenient for international members)
Maybe some smaller items too, like the Think Tank Pixel Pocket Rocket (have one and love it)
Memory cards
Software, such as Topaz Impression or Portrait Pro
Just some thoughts...I already have most of these--just trying to think what others might enjoy.