I used to own a Mk4 1.8T and the interior was awesome.
You can put blue LEDS in the Mk2 if you want the Mk4 "look", the kits are VERY cheap on ebay, as in under £10, but it will be a little fiddly to install them in the clocks. Personally I wouldn't mod much of the interior, but the Mk4 seats were much more comfortable, so i would like to have them fitted eventually, and then the door cards would perhaps need a new cloth to blend them in better, but still trying to keep it as OEM as possible while still having a nice daily driver to sit in.
PS... Mine's pearl grey (mostly

)
PPS... There is no "Collective" on here... Mod your car however you want to. The day this place turns into an ED38 nazi forum is the day I cut of my winky!
PPPS... Unless its just me, 99% of the girls I've met hate Mk2's. They would rather have a brand new Pug 207 with a nice cosy dealership warranty... So good luck with that!!