Hi Skozzy,
Here is a good thread made by another member which explains alot
The answers in summary are any DS lite will do, the modd is really via the card setups like, R4, TTDS etc.... , I am running a 4GB micro in my daughters DS don't know if you can go bigger, but with that size card you can cram heaps on. It depends on which card you use as to the features that can be utilised but you can certainly do everything that you have stated.
Good luck.
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