If you really must get an ipod....i succumbed in the end as everything revolves around them(car stereos, docking stations etc)- then i would recommend that you don't go for one that is priced purely on touch screen/style/image. You really only get a small amount of memory usually 16gb max. For instance an 8gb ipod touch costs about 164 quid whilst a 160gb ipod classic costs 173 quid.
If you're more into your music than you're image then i'd get the ipod classic.(the 120gb version is a little bit cheaper).
Mike