About a month ago I picked up an ifi iCan and I really like it with the Q701s.
My Q701s are stock, so the bass boost switch is a great thing to have. The lower level seems to really hit the sweet spot, but when playing game or listening to some electronic music the higher level works perfectly.
I also really, really like the 3D sound switch. For older stereo recording that way too right and left, think Beatles stereo recordings, the switch comes in handy. When playing games flipping it to the wide sound stage mode is awesome and expands the already large Q701 sound stage.
It's got plenty of power and all of the additions actually provide something useful in various situations. Visually, I think it looks great too. The bottom of the case does have gain jumper switches, so you can chose from low, medium and high gain.
I got mine open box from Music Direct, so mine was just north of $200. A great deal!