dont know how you will find it cheaper a good rs will make about 80bhp on a good day and it costs alot more to get over 80.my last rs which i couldnt get on with for some reason only made 83bhp after i spent £1500 at frank wrathalls.clutches dont take much stick i was getting about 5 meetings out of one.dont know about unleaded conversion but unless you run unleaded race fuel you will lose alot of performance and a top end will still only do about 500 miles.add your new crank every 1500 miles{you cant rebuild them} also 10 more bhp will hurt tyres over a production bike.just my ten pence worth but in the end only you can decide what you want.