Okay, so here is the thing. I currently have a R4 and a 2GB MicroSD but the setup kind of annoys me because I love to switch between games (and I've been craving some GBA action) but I'm limited by the 2GB limit. I was planning on giving my R4 and 2GB card to my bro and moving up to a 8GB (or more) MicroSD-HC . Ideally I'd like a Slot 2 device (that's the GBA slot, right?) that accepts MicroSD (2GB limit is fine by me) AND fits into the DS Lite. I'm not too concerned with it's ability to rumble or whatever, the ability to expand and sit in the Lite is more important.
With regards to the Slot 1 device, I'd like something like the R4 - that is, simple and easy to use and does what I want to (a.k.a. what the R4 does for me really), but with the option to use bigger cards and the ability to work seamlessly with the Slot 2 device I purchase (above).
I'm kind of confused by all the options out there (some Slot 2 devices are limited in space, others seem to cost more than similar products for no reason, etc). I mean, I see the M3 Real + M3 Lite Perfect but how is that different from the Supercard One + SupercardLite/SuperKey?!