What iPod should I get?

I am going on holiday to Miami in two weeks! I would like a new iPod, but im debating which one to buy. I have $400 spending money but i dont exactly want to spend it all on the iPod. I currently live in the uk. So Im trying to get as much money as poss, because I'll have like a 50 quid saving. I dont have loads of songs on my iPod currently I have the old 4gb iPod nano and ive used about a gig of songs and half I dont listen to. I really like movies. But I wouldnt like too many so about 20 hrs of video. I thought if I got an iPod touch coz i tend to use the internet a lot then I could have the perfect iPod.I tend only to put specific songs on it anyway so not much song space is needed. So my question is if I have a gig of songs on my iPod and dont have any photos really like 20 maybe, could I have my 20 hours of video, or like2 gigs of songs and like 15 hours of video. Ino that I can access the internet to watch films anyway. So im not too bothered baout the space