I have the Atomic Nano V3 regulator, with an adapter to a 20oz paintball tank. It works really well, though I have a few issues with it--mainly the lack of a high-pressure gauge. Since working pressure is fixed it would make much more sense to see when the tank is about to run out then to see the working pressure.
Here's a cell phone snapshot of my filter/CO2 setup, sorry for the poor quality. I've used a milk crate to reduce the length of filter hoses somewhat, since it seems to slow down some with longer hoses (regardless of height). The milk crate also makes a convenient frame to zip-tie the CO2 canister in place and prevent it from getting knocked over.
Since the filter etc are in the corner under my desk I haven't taken much care about how they look--though I should probably try and improve that somewhat.