I encode my DVD rips to 2GB or so each. Makes it easy, I can use the same file on my evo, my archos, my kids' tablets, and my HTPC. My 10 and 12 year olds have tablets. They are surprisingly good to them.
Evo and archos have 16GB cards...good for more movies than I need handy at any given time. I wouldn't mind the 250, it just wasn't out and I suck at waiting