Easy Cans to Drive and Amps

[Dash]

I currently have Sr60's, PX100's and HD 485's in the fold. Would any of these benefit from something like a Go-Vibe with my PC, home cd player and Ipod? Would it be worth the 60-80 dollar investement for a beginner amp? Any advice or similiar suggestions in the range would be helpful. I have searched the forums and not found what Im looking for in regards to low Imp cans and amps.
Thanks in Advance,
D

 

[xilron]

I know that the SR-60's and the PX100's don't need an amp. They are really easy to drive, and sound great without one. I don't know about the 485's though.