TDS-3 or Trojan Hunter not Tauscan it couldnt ID or remove an elephant with polka dots
NOD32 or Kaspersky, AVG is a decent AV for freeware

not all heuristics analysis is equal, alot depends on the rule sets
you pay for what you get, in security its the need to constantly update, heuristics is an important component, but signitures and specialized extensions are just as important.

The need for a trojan scanner greatly accelerates with the number of exectutables you try out (and where you get them)