Just checked on line at A J Sutton Front sprocket £51.06Lock Washer [size=78%] [/size]£4.21Rear Sprocket[size=78%] [/size]£80.76Chain £432.86Total £568.89
Go for o/e - you already know the o/e front is known to be best - o/e chain is endless, I've got a new kit meself for future use. Not bothered about messing with non-standard gearing for road, I'll be doing the same as you when it's needed, ie. swingarm off and greasing up etc. So your asking the question, but methinks you really know the answer already? I paid £149 posted for full genuine kit, shoulda been £179 but some dealers prepared to haggle, 'specially on Ebay. Don't forget to fit a new tab washer too, not worth the chance.