Looking for a new memory stick for this PSP3000 I'm going to pick up. Probably will go with a Sandisk 8GB or 16GB but I see so many different types I'm not sure what's best. I'm seeing normal Pro Duos, some called Pro-HG Duo, and some Pro Duos with Mark 2 on them. What's the best way to go with these, and are there any memory sticks to avoid (just plain suck, or don't work well with hacking a PSP)?