I use Roland DS-7s at home. pretty affordable, bi-amped, and gets a Digital In. Works pretty well for me.
I think the trick about most Monitors is gaining familiarity with HOW THEY TRANSLATE to other systems, very generally speaking.
So having at least another pair of standart stereo speakers and perhaps a pair of "shitbox" speakers (like the shitty multimedia speakers at any comp store) would be a good idea!
Another point worth thinking of (especially in the lo-mid-end price range), is the colour you would generally like your mixes to have, and pick the monitors accordingly.
From my own expirience, I usually see engineers tend having brighter mixes on "darker" monitors, and viceversa.
unless you have a wonderful studio enviorment, it might actually mean something.
Just my 2 cents..
Daniel Varfolomeyev.