I've got
MK4 Key and
EZ4 Lite
and they work perfectly doing what you've mentioned above. I can't speak for those products you've mentioned but I'm guessing they work the same.
The ones I have work great for me, I'm a Mac user so the only downside is I have to use Parallels to run Windows to run the EZ4 loader, which will patch the ROM file while loading it onto the memory card. It's a MicroSD card, so fairly standard and with an adaptor you can use it in any number of memory card readers. You get an SD card reader in the kit anyway.
Make sure you get MicroSD, I made the mistake of getting MiniSD but I use it in my camera now.
I think the option I went for is the best (a lot of research here and other forums was needed though) and it fits nearly flush in my Nintendo DS lite. Also supports sleep mode which I think is a bonus over the competition.
Let me know if you need any more help, I know it can be a minefield, so I'll help you as best I can, even with my limited knowledge.
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