Don't let the memory card reader stop you - a USB to every card reader/writer is only a few dollars these days. I got a free MP3 player w/ USB reader/writer with a 512Meg SD card.
If you get snesDS, you can run (some) SNES games on any of the cartridges.
Yes, you can add more than 1 ROM on a card.
Be sure to take into account that if you get a CF or SD solution, you can use multiple cards and get beyond a fixed solution. I have one 512Meg and two 1-Gig SD cards now.
IMHO, the best solution currently (which I don't have since I bought mine before these came out) is getting the Datel Max Media launcher and one of the mini-SD solutions as these won't stick out of a non-lite DS.
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