I can't help you chose between any of the options you consider, as I haven't got any personal experience with any of them.
What I do know is that I love my compressor, and that it serves as an important part of achieving my tone always being on.
It smooths out my play slightly, but more importantly help with adding some extra clarity and definition to my tone, also adding a good deal of welcome extra punch, finally I use it to boost the signal from my bass slightly and also it seems to add some undefinable overall niceness to my tone.
I am talking about the EHX Black Finger, which is a tube driven optical compressor.
It is on the bigger more expensive side of compressors, and don't have a lot of parameters to adjust, even if those it got still works great for giving you a wide range of options to adjust how it will process your signal.
Also mine isn't noisy at all, contrary what some people claim, including Bongomania on his review page.
If my Black Finger should ever break beyond repair, I would make sure to safe up for another one, since, as I already mentioned, it has become an important part of my tone.
Whatever you chose, good luck with choosing one that will fit your needs, preferences and playing style.
Also before mentioned review page of compressors by Bongomania might help you decide, even if I don't agree with his review of the EHX Black Finger:
Compressor Reviews
It has a huge database over most of the compressors on the market, and is a great source for information about these, what the particular models are good for and which are worth your time and which are not.
