I'm just going to run through the standard CD checklist for mills:
1: Does it have to be a benchtop? Do you have room for a full knee mill like a Bridgeport?
2: You should probably count on spending at least as much on tooling as on the machine.
3: Do you have a mentor or a contact who knows how to use a mill? The nicest machine in the world won't do you any good if you don't know how to use it.
4: Whatever machine you get, it's probably worth taking it apart and cleaning it up. You can look up details for whatever model you end up getting online.
5: At some point, Cory might post in this thread. If he does, listen to what he says. He knows what he's talking about (much more so than I do).
6: The search feature is your friend. A quick search for "benchtop mill" produced a ton of results. Here are a few you might find relevant:
[1] [2] [3]
It's definitely worth reading through some of these old threads-- most of the info is still relevant.
Best of luck with your search!
Edit: Based on those old threads, I'd look into a RF-45. Grizzlys work but... Well, the one in the metal shop where 2667 works is pretty much perpetually broken and the Bridgeport has been trucking since probably before I was born, so make of that what you will.