Your PSP memory sticks will not work, no. It would take way too much time to explain the various options you have. There are so many devices that it's confusing.
The main question is this: what do you want to do with your DS? Are you interested in any of the following options?
1. GBA games
2. SNES emulation
3. Running DSLinux without crashing
4. Having some extra RAM available if homebrew programs decide to make use of it - mostly DSLinux now, but other apps might, and the Quake 2 port will definitely use it
If you answered yes to several of those, you might want to consider a slot-2 device. Otherwise, slot-1 devices are easier to use and provide almost the same amount of functionality.
We can continue from here once we figure out what you want the DS to do.
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