From further down the list:
not exactly a TDI, (IDI, NA) and a bit high in $$ for that car (should be $1500 - $2200)
best bet is autotrader Advanced search (fuel type)
plan to drive to the SE to get the best deal, and no rust, Atlanta area seems to have the bargains
I say, get the Passat (creature comfort, ease of maint)
try to buy from one owner, not a dealer that claims one owner. The sales tax laws really screw up the sales of private vehicles, but just like buying a house, it is much easier to discern the condition by an honest chat with the owner (use your own sense, watch for smoke blowers, know what you want, know your price, be prepared to walk away)