I got a pair of these, Mini

Fairly large units (even though mine is the mini) but can be used for other things besides ipods. Been using them for the last 6 months and they have been great. Gets quite loud without distortion as well. I am no audiophile but I do think they sound excellent.

These guys, Ipod, Mini & Portable Systems had them on special for $499 and the larger ones for approx $700 when they relocated.

Hope that helps.