Nobody has mentioned the Panasonic RP-HTF600-S for $30?
EDIT: I forgot the OP said 'open', but leaving this suggestion here anyway since I don't have any for a closed.
They're warm sounding with quite a bit of bass. Decent soundstage. They're technically 'semi open' which I guess isn't as bad as fully open however they isolate poorly. I should also add I heard they are similar sounding to the Monoprice
Edited by Supertoaster - 7/28/12 at 5:28am