Andrea,
I'm not sure if you've had your fill of "research" by now. By coincidence, I clipped out this article on "choosing studio monitors" from the December issue of Electronic Musician. It's been sitting on my desk waiting to be read.
Here's a link to the article "online."
Mark
http://www.emusician.com/prntarticle.aspx?articleid=153461 Thank you, Mark: a rather generic but still useful article.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.