swap magic is just a boot disc. So of coarse you can still play original games. Secondly, it doesn't matter which swap magic you buy, just make sure you get the right on (ie. usa, PAL, or jap). Secondly, if you do decide to get swap magic, get the fliptop with it instead of the slide card or no solder mod (trust me it is a lot easier and faster).
yeah, but if you take a hair dryer to the warranty sticker, you can peel it off and put it back on if needed. Its only a 6 month warranty anyways, i believe.