I can't necessarily give a model recommendation, but I wouldn't think of using a mult-box that didn't have tranformer isolated outputs. A lot of the cheaper mult-boxes don't have transformer iso'd outs and therefore can allow buzzes and hums to invade all the audio outs if one person connects with power (ground) issues. I know cost is an issue, but some things are worth the extra $$$.
Whirlwind makes a passive press box that takes a line level input and distributes it into 6,12 or 24 (depending on model) mic level, transformer isolated outs. This would probably be an affordable box that may suit there needs. It's less flexible than I would like but would probably work for budget-minded customers.