I now own a pair of M-Audio DSM2's (wanted the DSM3, but they were gone very fast with the current closeout prices). And as I have stated before, I don't think anything can compare to them at the current price(s). These are not strictly M-Audio monitors that carry a bad rep amongst studio pro's, instead these were a collab with digidesign and everything about them screams quality, from the aluminum woofer and the ferrofluid cooled tweeters, to the class D bi-amplification, to the optional digital inputs and dsp dip switches for trim. At this point I don't think there is much of a step up until you start looking at Focals, Opals and the like. Also to note, I do not use these in a professional setting, just casual listening.
Lastly, there are a lot of reviews for the HSM series, a lot of people own them, as they were supposed to replace the NS10s that were so famed and relied upon for production/mixing. I think best bet would be to check out gearlutz for more insight on studio monitors.