A good inspector (as compared to the "checklist" inspector) will poke around quite a bit, and get dirty - literally. They will document everything and produce a detailed report (with written descriptions of what was seen, and what the potential consequences may be), but they won't be cheap. Expect to pay anywhere from $2,000 to $8,000 for a thorough inspection. However, given that the cost of unanticipated repairs is almost always many times higher than that, it's worth the money. If you are really committed to this place, then Designer's idea is a very good one. The home inspector can then be hired to confirm that the remedial work was done correctly and address the key issues.
When my wife and I were in the market for our first house, we were fortunate that my father, a civil engineer, was available to check out the prospective homes that we were interested in. He was, fortunately for us, brutally frank, to the point of leaving more than one prospective homeowner or agent in tears. We were more than once in total love with a place, only to find out that it was going to be too expensive to bring to a proper level of code compliance or even safety. The place we ended up buying (and are still living in) had some issues, but with excellent "bones". And we're ever so glad we did not go for some of the "jewels" that we fell in love with during our searches - we found out after the fact that almost all had to be extensively rebuilt.