You DO NOT need a magic gate for ANYTHING no matter WHAT Sony says.
Get one that's the size you want at the lowest price you can find. I've seen 128MB for about $40 in a brick & mortar store . . . I'm sure you could do MUCH better on line.
__________________ Remember: SEARCHES ARE YOUR FRIEND!
Go for Pro, or maybe Duo if you use or ar likely to get anything thatr uses Duo.
Manufacturer matter very little - IMHO go for cheapest manufacturer.
Avoid white MagicGate sticks unless you use ATRAC. But you probably don't