Hmmmmmm good question, if it fits, and thats IF it fits, a GSXR 2nd off of ebay would make a huge difference for not alot of £'s...
Failing that, time to get the wallet out and start spending the cash, Hagon do a good entry level shock which is not as adjustable as the more expensive erotic ones, but still does the job on the road...
Others to try are Hyperpro, WP, Technoflex NL, Ohlins, and others...
Best thing to do, is have a look on the web, must be a bandit forum out there somewhere thats tried out different shocks then given a writeup on em
