Dave I have been reading about your search for a combine. I am mainly a JD guy but I have traded/sold a lot of Gleaners too. Here are some things to keep in mind while looking for your combine.
1) Good small/medium size combines are selling for a premium. There are not any new ones being built. This makes the good machines sell very well and fast.
2) Watch out switching between series on the Gleaners. Example F2 and F3. There are differences in how the grain headers operate as far as the automatic header controls. Finding the correct kits/parts is getting hard to find to switch one over if you need too.
3) A good higher priced machine can very well be "cheaper" in the long run. The big reason is the cost of repairs is getting higher so the up front saving on a cheaper combine can be eat up real fast in repairs. You also have to consider timeliness of harvesting. I assume you work off farm. So if your combine breaks down you could be out of the field for days while you repair it. So if we have a rough fall to harvest in you can easily run out of time before snow/weather effects your harvest.
4) The higher grain prices has pushed the price of combines up. A good machine that would have been 10K 3-5 years ago can easily be 20K now.
Good luck in your search.