If you are practicing at a desk go with studio monitors. You can pick up a pair of KRK Rokit 5s for around $200 used (maybe a little over that). For a little more the Yamaha hs50m is really raved about, also.
Hope that helps!
Agile AL-3200 Rootbeer Flame LP
Axe Fx II
FCB1010 w/ Uno Chip
Carvin DCM1540L power amp
Avatar Traditional 4x12 (WGS Retro 30s)