lotto/contest/random number gen?

[trilOByte]

Hi guys, I'm looking to impliment a contest system on my boards. What we do is purchase (for real) an item, usually expensive ($200-$500) and raffle it off to various members. What I would like to do is have some system where I can place certain members into the lottery and have some "forum-wide" visible random generator" pick the winner.

Any ideas if anything would be suitable?

I've done a search and seen there are lotto addons for the store hack, but I dont want to impliment something that complex, that's really targetted for RPG sites anyway.

Maybe something like a random "$bbusername" picker, that selects from a defined user group?

Is there a way I could enter some code into a post, something like
-----------------------------------
And the next winner is:
$bbusername[random]
-----------------------------------

from a particular/defined user group ID?

Any help would be appreciated.
Thanks.