These-

http://www.americanmusical.com/Item--i-BEH-B2031A-LIST

These fit your bill. Not enough room? Make the room for them. You want an 8" monitor, playing sax into them. These monitors are fantastic general listening monitors. You can also mix on them- perfectly fine for your skill level as you've explained it. They're powered- just plug them in. I still have a pair in my studio. Listening to music on them is amazing- seriously. You're not gonna find a more resonably price 8" monitors and they fit your needs. People crap all over these monitors but if a slim budget rules- they will not disappoint for your needs. Good luck.

Btw- pick up a pair of mopads with them too, if you can afford it.

Dan