My buddy from Church let me borrow his Yamaha HS80Ms because he wasn't using them. I figured I'd run some sine sweeps measurements in Room Eq Wizard (with a calibrated rta mic) to see if there would be a difference between my speakers (M-audio Bx5s) and his. The only place I saw a real change is above 1hz. You can see (I attached the results) that room modes play a big part in any room. I would tell anyone who was interested in buying studio monitors (or just upgrading) to first look into the controlling the acoustics first. Keep in mind that I have alot of acoustic treatment up in my studio (I need to buy more bass traps as you can see in the results). My studio is in a small room so that's why I think I'm having a bass issue.
I also had both speakers setup to a M-Audio bx10 sub. I messed with the knobs on the Yamahas to see if I could get a flatter response but it didn't really matter due to room modes.
The M-audio Bx5s cost me 200$ for the pair and The Yamahas cost 349.99$ each on sweetwater.com . I'll probably just go back to using the Bx5s because I was just getting to "know" their sound.