I've got a Sony Xplod CDX MP40.
It's a nice little unit, costs about ?180. (I actually got mine at a discount for ?140)
Does all the usual radio/cd/mp3, displays ID3 tags as the mp3 starts, scrolls the title, then holds the first bit of the title on display.
It's pretty good at changing tracks quickly, when you first load an mp3 CD it's a little slow but that seems to allow it to index the disk enabling faster track and album switching.
IE, if you organise your mp3s on the cd by artist then by album in directories, it will allow you to flick from one album to the next with one button push.
Just need to move it from my Mk3 to the Mk2 now.