We can't help you with roms, sorry. See the forum rules.
However, I can tell you that with GBA binaries in general, the M3 Perfect is better than the Supercard. The Supercard uses slower RAM, which brings the price down but it also means that sometimes data is not supplied fast enough, causing slowdown. The M3 is more expensive but has faster RAM, so no slowdowns occur. Since you are going to be running this on a GBA, and the intended use is for GBA binaries only, I would recommend the M3. For usage on a DS, they are both about the same for homebrew support, but for GBA, the M3 would be a better choice.
The page you linked to is a fairly decent price for a SC miniSD.
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