I had a std car and put a 65mm pulley on, made it growl a lot louder and sounded awesome when tensioned correctly. My V-belts were tired though so would stretch a bit and go quiet after a few days. The power delivery is a lot sharper and makes the car pick up a LOT quicker. however bear in mind it's stressing the charger more as it's spinning faster than it would do before at any given engine RPM, so if you haven't had your charger serviced then it's worth considering. I was lucky really, 19 years and 80k miles of an old man and a gentle female driver (from what I can make out- I think she prefers RWD turbo Jap cars) meant my original charger is still going strong (now 84k) but it'll be serviced before I use it again.
I fitted a full blend charger with toothed belt kit (65mm pulley). The noise is a bit odd at first, it just sounds like a REALLY tight cambelt (this is effectively all it is), The advantage is no belt slip, the V-belts used to slip from ~4.5k rpm but it's whether you want to pay £200+ for it or just want to try new v-belts and some sticky belt spray (about £5). I'd say I preferred the growl of the original set-up but it's annoying having belt slip, especially if you're expecting it to be on full chat halfway through an overtake and suddenly the belts slip, it's like lifting off the accelerator. I've noticed I make 1.1bar @6k rpm now, with the V-belts on this charger I think it peaked at 0.9bar, but it needed a seal replaced.
I've forgot the pressure difference between std and 65mm pulley but I've got it written down somewhere.
I've got a 65mm v-belt pulley if you're after one