Looking at buying a FZS600 again.

[Fazerider]

The mileage thing does concern me as i didnt want a too high mileage bike, although i dont do that many miles a year, only about 3.5k in commuter miles and very rarely go out on weekends any more.

Why obsess about the mileage? The Fazer engine will typically cover at least 100,000 miles before needing significant attention, so should be good for a decade at your usage level.
If it's running well and brake discs etc have plenty of life left, there doesn't seem to be any point in worrying.