Wheel/Tire Ignoramus

So let's start by saying I don't know much about wheels and tires other than what I've read here.

Driving through town today I see a nice looking wheel and rim chained to a stop sign for sale so I stopped to look. Here is what they were:

Set of 4
Konig Incident 17x7 5-100/114.4 GRM
Here is a picture: http://www.discounttiredirect.com/product/wheels/koninc.grm.ang.jpg

Yokohama S-drive tires
215/45R-17 91W XR B

I didn't see any scratches or curb rash - just a little brake dust.
The tread looked almost new. There was only one set there though so I don't know what the other 3 look like.

I checked the tire size on the chart TJ posted the other day. It is in the green. Will the wheels fit? I know the offset makes a difference. I don't know what it is though. Does anything in the numbers above tell us?

The sign said $700 OBO. Discount Tire Direct lists the wheels at $110 and the tires at $120 I imagine there are shipping charges and then mounting charges when they got here. I'm guessing around $1000+ new.

Does anyone want to give me pros and cons to the wheel/tire set?