Can only echo what has already been said.
I have had a mk4 2.0 8v ( im not gonna call it a GTI cos it never deserved the badge), and a string of mk2's, 1.8 drivers, 1.8 gti's, 1.8 16v and now a 2.0 16v.
My basic rule of thumb has always been to buy the best i could afford, then give it a full going over anyway, discs/pads full service, new cambelt etc. I have NEVER had a mk2 break down on me.
Mk4 broke down within 3weeks of owning it (water pump packed up) despite only having 60k on the clock.
Have also driven a 180bhp 1.8T, and drove it again once it had been mapped to 205bhp, was still not "special" like even a mk2 8v is.
IMO from driving them, mk4s are gutless and handled like Turd and the only mk4 even worth considering in standard form is the R32. And when your spending that kind of money you could build a supercharged mk2 VR6..................
know what id do!