| Its best to get the dealer to give you a rough estimate as to how much they think the service will cost. I was quoted around £450 for 2 year service on my 999r, when I came to pick the bike up they said it was £660. I told them they had previously quoted around £450 and just like magic the bill reduced to £500
Also some jobs included in the service shedule might not be necessary (depending on mileage since last service) eg fork oil, you can ask for these jobs to be left out in order to get the bill down.
P.S - there is an article on a 748 in this months Performance Bikes magazine that has done over 50,000 miles without missing a beat. | 
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