if you have gen handles 9 times out of 10 all they need is greasing. even brand new gen vag handles need greasing before they'll work properly! if you take the handle off and find its a pattern one, just put it back on and done bother messing with it, generally nothing helps they're just crap. instead get down scappy and on ebay, hunt out gen vag handles, or buy new.
polo mk2/3 and golf mk1/2/3, scirocco and cabrio all use the same handles. prob a few others as well in vag range so look around. really early mk1 and passat etc are different though.
all the random old gen vag handles ive had from scrappy have been perfect though, they last forever,. its just they go stiff and people assume that they're broken, without actually trying to service them first. if you leave a stiff handle too long eventually it'll break, so do it asap. its only 2 screws so you have no excuse

also you can fit rear handles on the front simply by bashing out a pin and swappign the finger over, i.e. the bit that moves up and down when you press the trigger. fit a remote central locking kit and delock, removes 1 way of a theif breaking in. not a massive deterant though as there are loads of other ways, but at least it looks nicer

part numbers:
191 837 207 - front left, without lock - deleted
191 837 208 - front right, without lock - 23.49+VAT
193 839 205 - rear left - 31.14+VAT
193 839 206 - rear right - 31.14+VAT