Have an old DEH7000 somethign or other, works with the iPod well, pretty intuitive, and has LOADS of sound options, hi pass low pass, 7 band eq etc. etc. etc. etc.
Only problem is it has blue illumination whichmatches no car I've ever owned ever.
Alpine and kenwood do amber coloured ones these days iirc.
Either way, you cant go wrong with branded, I've had good experiences with both brands, just get the one thta meets you spec/budget