I have three Pure Dabs and they are all great, the best of the bunch is also wifi so i can stream all my music of my home pc to it, a bit over your budget but if you look around on the net you can get some bargins,also try and get one with the "chargepak" (rechargeable battery) so you can unplug it from the mains and use it anywhere you want
http://www.pure.com/products/product.asp?Product=VL-60896&Category=
Also worth thinking about is do you want to play a mp3 player through as some have audio inputs aswel as outputs
and one last thing, not too sure if its going to happen but i did read about a new Dab+ format on the way soon so if your radio is not able to upgrade(most pure's are) then the radio will not work on the new format
http://www.digitalradiotech.co.uk/articles/DAB+-likely-to-launch-in-the-UK-in-the-next-3-years.php
Andy