i personally look at the Freq limits when choosing a speaker, esp a Powered speaker. Fact is if you use the speaker for close up for a computer setup with normal volumes you will never use 90% of what the power that speaker has. Just to give you an idea of watts and power needed At my business (bar/lounge) we use a 30 watt 70volt amp to power 6 small bose 201 speakers (all the speakers run off one cable in mono), at 3am when people want the entire bar loud with music this is the setup to be used, and it is not even turned up 60% of the way....and this is used in an area that can fit 100 of your computer desks in at least. Point is don't look at watts, they mean very little..esp to your computer desk and how close you are to them.
as far as the speakers you mentioned i do have some experience with the M-Audio's (i have the bx8a myself) but not the other two names you mentioned. the Other two seem to be a personal consumer close range speaker where the M-Audio is a true Studio Monitor (a cheap one but still a studio monitor.). If that is the case then understand the consumer speaker market and Studio monitor market are very different from each other, Different purpose almost completely! Studio monitors need to be as close to FLAT as possible and they don't care about any useless to your ears pretty looks. Studio monitors are used by people that depend on them for their business and livelihood. Consumer speakers must look pretty as they double as a peice of furniture or decor of a living space, they tend to have a certain sound signature vs just being flat, and they are just a hobby or a play item to someone more then a studio monitor.
I went with the huge bx8a's because of the freq specs mostly, they ride down low enough to reproduce any instrument without the need of an dedicated sub. I like the flat sound for my computer area as i use a flat dac along the line (Dac-1 usb). I love the full range but flat sound from them really! You may like a more mellow or lushy sound, something like a tube amp would give, maybe you might like a warmer sound also...either way I would recommend you to learn the difference between the three and what they are really used for and what market are they marketed for. Then try to listen to a few of them if you can to see if this is the sound you want. I would also recommend you to look at Freq limits if you want to just use a 2.0 setup.
if you take the time and do some research and listening you can walk away with something so perfect to your ears....good luck!