QUOTE(Slipstreem @ May 4 2008, 13:02)

I have a feeling that the words "big" and "cheap" may not go hand in hand in this particular situation.

As it has been said, near-field monitor speakers are designed for close range listening. But depending on their size.
Monitors can fill a small room just as regular "bookshelf" speakers do.
6" and less cones monitors should be as close as 1-1.5 meter in front of you, while 8" cones monitors are intended to fill a small listening room, such as a (home-) studio control room.
Yamaha's HS series monitors are very fairly priced, quality-wise, and so-on very good choices. They have two models HS80M (with a 8" cone, about 500€ a pair) and HS50M (with a 5" cone, about 300€ a pair)and a subwoofer HS10M.
A friend of mine has a pair of HS80M firstly for mixing purpose, but, believe me, listening to music on them several steps away from his desk, comfortably sitting in a sofa, you won't tell those are "monitors" but a very good stereo.
Personal opinion though

On the other hand, smaller HS50M really lack bass.
My personal opinion about getting a pair of amplified monitors for listening to music, and why it may not be convenient for this and your usage, is because those are not designed for regular music listening and they lack all the convenients of a dedicated stereo.
If I were you, I simply would go for a regular hi-fi stereo, an amplifier plus passive speakers, because monitors:
-have only one input, meaning one cable per channel,
-have no stereo volume control, but a dedicated volume control on each,
-require line inputs, most often only with XLR and/or 6.35 jack,
-and so more inconvenients compared to a stereo: you cannot directly manage multiple sources, and stereo master volume without something like a small mixing table.
And in a few words, monitors can also, by design, make recorded music sound as well as it might also make it unpleasant to the hear or lack "color", or reveal bad details (a bad mix, encoding artifacts, etc...), because of their "neutral" response.
Some info of interest (including kind of criticism too) about studio monitors in Wikipedia
here.
I personally like the way monitors sounds, but it's an habit.
Sorry for being so long, going further than the question but I liked the subject

Hope I helped!
Alex.