New to Forum and looking at 2007 Vstrom 650

Hi Folks - Thought I'll drop in and say Hi...After riding sport bikes for over 15 years, I'm contemplating in picking up a Vstrom.

I'm looking at a 2007 Vstrom 650 with approx 22km. Bike is in very good shape and rides very well. However, it looks the valve maintenance has not been done and it will be due for a rear tire very soon (will also replace front tire as I noticed a slight cracking in the tread). The bike currently has a Givi top box along with the frame bars.

1) As such, what do you guys think is a fair price to pay? Oh, the oil changes have been changed every 4km.
2) What can I expect to pay for a valve check/work? Any recommendation for a good shop in Sydney?
3) What type of tires are you guys running? I suspect my riding will be mostly on pavement.

Any input is greatly welcomed!