To give the usual answers:
mk2 abf bestthingeverforserious.
A3 140 TDI S-line golfindragyouguys
2.0 8v hasmoretorquewhydon'tyoubelieveme
Mk5 GTI cangetnewfor5khellaserious
To give an actual answer:
Dom's mk3 is mint so it would be a good choice

If you still want a newer car make sure the mk4 you go for is in good condition and the common problems have all been sorted.