Honestly, if you are asking about maintance cost.. I wouldnt Buy it......
Actually, Thats my TT thats for sale... And not sure why you are are looking at 03+.. when some are the same... minus the weaker 2.0T compare to the old 1.8T
well you have 3 diffrent trims
You have the TT 180, FWD, TURBO a weak 180 Crank horses.. response well to mods, especially chiped.. but you will still be slow.
the TT 225 ( what I have ) AWD, Turbo 1.8T, 225 hp/207 tq (crank) responds well to mods.. Mines already chipped, exhaust, DV valve and K&N Drop in...
then you have the TT 250 V6 = useless.
I would choose the 1.8t over the 2.0t ( newer TT) anyday.
But honestly, they are not cheap when they brake... Unfortunatly you are buying a VW with an AUDI badge and when shops see the AUDI badge they think you might have money.. maybe you do.. I dont know, but since you asked about maintance.... it might be a problem......
Cool cars though... =]