DescentBB

I've now come to the point where I would like to create waterblocks and machine heatsinks. What's a good tabletop model?

Grizzly makes some inexpensive mills. I'm guessing you don't want to spend $25k on a Bridgeport CNC mill to make water blocks
I've never used there metal working equipment, but I have used there wood working equipment and the performance was good. The finish leaves a little to be desired, I think they are ugly, but they have it where it counts.

Do you have any tooling, collets, flycutters, precision milling vice, T-slot nuts, clamp down kit ect? Man that's a lot of money to get into just to make water blocks.

x2. Cost prohibitive, unless you're going into business.

I don't want to bother with CNC at this point in time. As long as it can fit on a bench and is a manual setup, i'll be happy with it.

This model looks like what I need. stupid long link

if you're going to ebay it, you'll rather take what you get cheap than what you set out for.
good luck.

one hint at the least, if you've never touched such a machine before: be very careful.

I'd stay away from Grizzly unless they have improved quality. I junked a 500.00 belt sanding machine as it would not hold the sanding belt true. I got their 18" band saw but the tracking wheels and the blade guides are el cheapo. The only thing good I did buy was a two bag dust collector.
Depending on the amount of precision needed you might be able to find a decent used piece of equipment. Check your yellow pages under used machinary or try the Sunday want ads in the newspaper. I found a 18" radial arm saw for 500.00 dollars that works great. New that saw is over 5000.00. Also try business auctions as sometimes you can find what you need there.