I've been through numerous desktop speakers and was not happy with any, especially with the integration of the subwoofers, which was often on the floor.
I decided to go a different route. With an arbitrary budget of $700 I went to Sam Ash music and auditioned just about every powered speaker/monitors they had. I ended up with the Fostex PM-2 speakers. I paid a bit under $500 for the pair and am very happy with them. The bass and treble are well integrated and the resolution is very good.
http://www.fostexinternational.com/docs/products/PM-2_MkII.shtml
HF unit : 25mm Soft Dome
LF Unit : 200mm Aromatic Polyamide
Frequency Response : Free field ± 2dB 50Hz - 20kHz
Low Frequency Cut-Off : 40Hz (-10dB)
High Frequency Cut-Off : 22kHz (-10dB)
Amp Power : Low Frequency: 120 watts, High Frequency: 120 watts, 240 watts total
Amp Distortion : >0.05% T.H.D. @ 50w, 6 Ohm 20Hz - 20kHz
Amp Signal to Noise : >90dB 20Hz - 30kHz , not weighted
Amp Slew Rate : 10V / µ sec
Physical Dimensions : 254w x 411h x 300d (mm)
Weight : 14.7kg