Agreed with Antonye, the valves on the normal RGV's can be a concern. and at around £500 for a set they aint cheap either. The RVF is heavier but great fun and the sound of a V4 howling through a good system is addictive. Pound for pound the little NC30 is no less of a bike and half the money so long as you can live without USD forks. Spend your money on a nice NC30 and put the extra dosh towards getting the suspention sorted and carve your way to the front on a budget

You need Suzuki kit valves, there a lot stronger and dont fall to pieces , but they aint cheap