Music creation?
Throw all the computer speaker brands out the window.
Don't get M-Audio monitors, they make good, cheap MIDI devices, but their monitors are rubbish (in my opinion).
Behringer make a couple of good passive montors, but they are expensive, and you don't want passive anyways, so that's redundant.
My personal choice, what I'm using at the moment are a pair of KRK V6's and they are effing brilliant. If you can get your tracks sounding good on those, they are guaranteed (in my opinion, again), to sound good on anything! I personally had a ground looping issue with my audio interface, computer case, and studio monitors, but when I eventually sorted that out, I was basically in la-la-land. They are absolutely wonderful units and I would not exchange them for anything. Back when I got them, they were kinda steep, I believe 320 apiece, but they should be less now. They have the smaller V4 series, in fact they even have a newer series out now (I haven't done much research on reference monitors of late so I'm just going by my experience here), so you might wanna give those a look.
KRK makes 10 inch and 12 inch subs for their monitor series, so you can always look to add in a sub channel to your studio in the future, and they will be consistent sounding.
Hope the advice helps
, happy hunting.
Btw, Sweetwater is a fantastic place to shop!