Being that my knowledge of cameras is mostly theoretical, I thought I'd appeal to the amassed knowledge of OcUK's photographers 
My gf has decided to take up photography as a hobby and intends to shoot landscapes, wildlife, urban environments and the like. She's not very technical so a basic camera will last her a good while before she grows out of it, and budget is a big focus.
On the one hand, she could go new and get something in the £400 range using a finance option (so D3100 sort of range), or we've also been looking at used 400D's on ebay for around £220. My only concern there is the use of CF instead of SD cards, should I be concerned or is this nothing to worry about (eg rising prices, future availability)? She's quite enthusiastic about getting started straight away so stretching up to higher end models isn't an option on her budget.
So what would you recommend?

My gf has decided to take up photography as a hobby and intends to shoot landscapes, wildlife, urban environments and the like. She's not very technical so a basic camera will last her a good while before she grows out of it, and budget is a big focus.
On the one hand, she could go new and get something in the £400 range using a finance option (so D3100 sort of range), or we've also been looking at used 400D's on ebay for around £220. My only concern there is the use of CF instead of SD cards, should I be concerned or is this nothing to worry about (eg rising prices, future availability)? She's quite enthusiastic about getting started straight away so stretching up to higher end models isn't an option on her budget.
So what would you recommend?