Try a R4 or a M3Simply, they're slot 1 solutions, they both come with media playing software - music and movie and will run homebrew applications such as DSOrganize (current version has a text based web browser), Moonshell and others. UK sites sell them but charge a hefty price for them (around 40). US sites are way cheaper (got mine for 16) but delivery is two weeks'ish.

You'd also need a Trasflash card (MicroSD) which can be picked up from www.picstop.co.uk (1gb about 7quid or 18quid for a 2gb) to fit inside the R4 or M3.