like marz said if u have no desire to play gba games then a slot-1 solution is the way to go. compatability is very good and they're cheaper considering their simple design (no ram chips for the gba support) and the fact that you don't need a passme device. fifthelement's review of the m3/r4ds...
i have an m3 however i registered and posted on a few ideas i would really like to see implimented into the ds_menu.dat file system. i figured hey if r4 does it and its well accepted then m3 would likely follow considering they're the same.
It's not the movies or games downloads that I would worry about, like breaking into networks, downloading encrypted things, spying on network traffic. I have seen so many "Top Secret" seals on files when I was a kid
I was obsessed with finding UFOs, a surprising amount of US files where stashed on computers in other countries, China back in the early 90s omg sooo much