If you or any of the other guys want to try a real lambic you should look for something from Cantillon or Drie Fonteinen. Here are a couple good lambics that are relatively easy to find:
Cantillon Gueuze
Cantillon Kriek
Girardin Black Label Geuze
Drie Fonteinen Oude Geuze
Drie Fonteinen Oude Kriek
Geuze's will be more straight up tart and funky, while kriek's will be more fruity considering they are brewed with cherries, but most aren't overly sweet at all.
The only downside is the cost. Real lambics aren't cheap, they are brewed almost exclusively in Belgium and the price gets inflated a pretty fair amount.
It's worth a shot though, especially if you are into tart, acidic, funky flavors. They certainly aren't for everyone though.