I use a pair of Behringer MS40 monitors in my GuitarRig / Reaper recording setup. If I recall the set me back about £90 (I was shocked to see how much one can spend!). I've been really impressed with them. They're no tube amp in terms of volume, but they're loud enough for a large room setup, I've never had any issues with the sound breaking up due to volume. IMO very good quality/value.
A diagram of my setup just in case you're interested
Edited by Noise_Maker (13/05/10 02:01 PM)
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Guitars: Cort Earth Grand, Cort G250 RMS, Kimbara Strat Copy, Vester Strat Copy (Stage Series), Custom Build LP Style (By Steve Benford), 'Podcaster' Custom Build prize! (tele Style), Variax 600
Mac based recording and VOX AC4TV