Sorry computer is down and I hate typing on the phone.
Most of the "DRO"s on the mini/bench Mills aren't real dros that I've seen. Usually it's just a linear scale on the quill, which is mostly useless for traditional milling.
Most knee Mills with DROs only have X and Y scales, as Z or quill especially, are highly limited, and typically very easy to indicate.
A power feed on a Bridgeport is much more limited than a true mechanical power feed that's on most larger knee Mills. I use the one on my BP only for light facing, occasionally, but mostly for the rapid traverse when setting up. On my K&T on the other hand, which has true mechanical power and rapid traverse on all axis, I use them constantly, it even has micrometer stop on the sliding head, which is a killer feature, I should utilize more often.
I wouldn't base a purchase on having a power f eed on a bp, just like I wouldn't base it on whether it's a variable or step pulley head. I'd just look for the nicest one I can find that the owner can show you how nice it is.
Listen to it run, watch him take some cuts, don't buy one that needs any repairs, don't confuse dirt for damage. Mostly you need to get a good feeling the owner is knowledgeable, cares about the machine, and is honest about what is good and bad. $5k should brrimg a very nice one if you're patient.
Keep your eyes open for a Wells Index mill with r8 spindle also, they're basically Bridgeports but much nicer.
I'll say again, I'd take a clapped out bridepoet over one of the bench Mills myself, if it's the same money. Now, I understand the appeal of new, and you can do good work on bench mill, if you get a nice one, but if you out grow it, you're not going to be able to recoup your money, where as a bp will likely be more valuable if you maintain it.
This is just my abbreviated opinion, because I can't type more atm. A full size mill may still not be your best option, but it's a huge upgrade if you can swing it. That's suitable for more than just knife work.
