At that price I would do the Inspection II at the shop, and also the cooling system. You don't have a valley pan, that is on the V8.

Mechanic's recommendationsand approach seems reasonable. they aren't trying to over repair it. Everything listed here is regular maintenance. You should be aware that with a vehicle with those miles, doing everything on the list doesn't guarantee that you won't have something else fail at some point. Expect ongoing repairs, not necessarily large ones, but it isn't a new vehicle any more and since they are just doing an inspection they can't guarantee that something else won't fail.

I would have the crankcase ventilation system/oil separator checked and any hoses that are soft replaced.

No comment on price, that depends on your market. Whether you want to screw the seller down depends on your relationship with them.

Good luck.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue