I think it would be well worth upgrading to something bigger like the golf VR6 brake disks and pads. The extra size will give a lot more feel. Stick with vented, grooved does not add much IMHO and can actually reduce wear time as they have been known to snap when they get hot and are worn.
If its an earlier model, pre 03, then it might have the 288mm front brake. these can be swapped for the later 312mm setup. the calipers themselves are the same its just the discs and caliper carriers that are different. however these need 16" alloys
Get some decent pads and you will really feel the benefit. Pagid are pretty good pads and work well from cold.
Visit the local breakers yard and see what bigger Audi,VW or Porsche disks fit your stud pattern.