Jim,
I don't know about the Hardinge TM/UM except that I have heard great things about them for hobbyists use, especially when a Bridgeport "M' head is attached. They fetch a premium price because of their attractiveness to hobbyists- about $1500-2000.
I own a Burke #4 and Van Norman #12 in a small basement, so I can comment on those.
Mine are not currently operational, but Jim B. has a Burke #4 and uses it quite a bit.
Burke #4 is a good, sturdy, small machine- mine is on the original machine base.
The machine is old, dates back to 1946. The base is tapered and allows you to store stuff inside and has a chip tray on top. I used two boards to make two shelves inside to store tooling and stuff.
It has power table feed and feed changes via belts and a Master gearhead motor.
If you buy one, try to get the vertical head, which is rare and fetches a lot of money alone.
Also, get arbors, as many as possible- they are also rare and go for bucks.
The machine spindle takes BS9 taper tooling, and the vertical head takes 3c. The BS9 collets are sold by Tools4cheap.net. The mill weights about 650 pounds with the motor. It can be separated from the base, and transported in pieces quite easily in sections 200 pounds or less. Mine has Zambus/Carrymaster wheels on the base to roll it around on. You can get one for $500-$750, maybe a bit more with the vertical head. The MAJOR negative- it's table has ONLY ONE T-Slot!! Otherwise, a good home shop machine. There are pictures of it on the site.
The Van Norman #12 is a big, heavy machine- 1800 pounds of old iron. There is a thread of me moving it down the steps to my basement. This wasn't an easy process, certainly not like moving the Burke #4. Mine dates to 1946. It's more of an industrial machine. It has power table and spindle feed. The cutter head is universal, insofar as it tilts to allow you to use it as a vertical and horizontal cutter. The MAJOR negative- no quill!! A Bridgeport M head can certainly be adapted to it for vertical operation with a quill. It takes 5v (Van Norman 5c) collets. Tools4cheap.net also has them. The arbors are rare and fetch big bucks. Tools4cheap makes them also I believe. The column and base separate for moving. Together they weigh 800 pounds and are the heaviest parts of the mill. The base is about 450 pounds and the column about 350 pounds. I moved it alone, but most normal guys get help. Hire a towtruck, and have them use the crane to move it and drop it into your basement. These mills can be had for as little as $500, depending on condition and seller motivation. There are lots of photos of them on the site.
Hope this helps.
Nelson