Wow, houses are cheap up there!
From the site I looked at, it looks like it is a complete remodel, so most of the issues from a settling foundation would likely be masked. Things that would have been a problem if doors and windows were not replaced would have been doors would not stay open by themselves, binding doors and windows due to settling, cracked walls, cracked tiles and all those problems could return if the house is still settling due to structural or foundation issues.
The driveway crack makes me thing the major settling took place away from the house foundation.
An inexpensive laser level would tell a lot if you are serious about the house, mainly If the foundation was settling, you would be able to tell if it is the perimeter foundation, or if there was settling and sagging towards the middle, and given that it does not appear to be a very big house, you may have undersized joists for too large a span if the sagging was towards the middle, for which you could add footers, a post and beam to prevent further settling, although in your area, that may be a huge task to get to footing depth. Here in Florida, it would be no big deal, since our foundations are only 12" deep. I think an inspection of the crawl space would be a good idea, to see what kind of foundation you have and the condition of the joists. Don't know if you have termites up there, but I lived in one crawl space type house, where termites ate every other joist, which ruined their integrity.
Another big issue is that if you jack up the floor to level it, you will cause new problems in reverse...doors, windows, cabinets, drywall cracks tiles if there is any. best you could hope for would be support the floor as it is to prevent further damage and do a cosmetic leveling of the floor if the slope bothers you.
I have worked in many houses where it is not uncommon for the perimeter foundation to settle about an inch, mostly cracked tiles and binding doors and doors that won't stay open with this type of settling and when I remodel, I just level out the floors when they are opened up, and reset the doors usually no other major issues.
Bottom line, if the problem is ongoing or if the settling has stopped and how much is it sloped, 1" may be O.K, more than that, I would be concerned.
If you are serious about the house, I would definitely hire a reputable home inspector