Do a REVO remap, it's free for 16 hours or so and you can then see if you like it, I loved it on my 1.8T Audi but could not justify the £500 price tag, but if you got a spare 500 lying around, try REVO first.
Ohh looking at the prices its now 330 quid plus VAT for the remap on the pre
2000 Golf GTI, get the free one done first, abuse the power for a day or 2 and see for yourself.Nothing to lose mate !!!