So I ended up buying it last night and drove it home. The engine noise actually seems like it MIGHT be exhaust, it's really loud drivers side near the bottom of the vehicle. I'm hoping its something simple like that gasket between the header and exhaust. The sound pretty much goes away at highway speed or at least isn't noticeable.
About half way home though the oil pressure tanked and the dummy light came on. It sounded normal, no additional noise so I finished the drive home. Checked the oil - full. So I figure it's probably just the sensor and i'll change that when I change the oil.
It had more miles on it then was originally estimated, 184k instead of "160 some", but that's ok with me. It was only $900 and that came from a tax return so it feels like a free SUV to me. The odometer can't be read with a flashlight, but a mile or so down the road it kicked on and gave me a chance to snap a picture of it for registration purposes.
I tossed a half a can of Sea Foam in the crank and half in the gas tank before driving it home. Figured if it had any sludge that'd help clean it out. Will most likely run some hard core engine flush through it before I change the oil and drop the pan to clean it and the oil pump screen.
Overall it seems like a good vehicle. It drives good on the highway, shifts perfectly. Needs new brakes but that's easy enough.