You must be in the really old DS scene right now hahah. Thats how I started. Anyways. Forget all about the R4 name. The original company died and the carts available today are just clones. Some are good (*cough* r4ids.com *cough*) and others are not (*cough* r4isdhc.com *cough*). Today the major cards are the r4ids (supports wood kernel which is very good), and the Supercard DSTWO (Has some awesome features like gba and snes emulation although now supercard is pretty much dead). I think the Acekard 2i went downhill a while ago.
Alright buh bye.