Picking High Precision CNC under 5k

Hello All,

Our group is looking for the right CNC to make our own microfluidic devices. We will be milling metals (mostly aluminum), plastics, and semiconducting materials (silicon and silicon dioxide). We need features that are in the micron range, something between 10 and 1000 microns. I can't imagine we'll be making a device bigger than, say, a credit card so I figured a bench top machine is all we need. Our designs are fairly simple, being just channels for fluids to travel. I have some experience with CNC, but I am by no means an expert. We have about 5k to spend. I've been tasked with looking for the right machine, and I wanted to start by asking the experts to point me to some reliable companies. I'm a fan of diving into research, but there are some time constraints, so I'd rather not dive in blind.

Any help would be useful. Again, a set of reliable companies for high precision bench top devices would be appreciated. Beyond that, a list specific machines to look at would be awesome. In general, I would also like features I should be looking for and perhaps some bells and whistles that I simply may not need.

Thanks!