Ok, I read and compared everything I can find about the R4 and DS Extreme. I haven't even bought a DS yet and this is my first flash kit since the GBA. After reading all the FAQs and reviews I just need to know what I do and don't need to purchase. I chose the R4 since it's cheaper and sounds like the most reliable. What I don't understand is the use of SD cards. Are they needed or optional storage for saves? I'm guessing needed, but do they come with the card? I'm wondering if the reason the Extreme cost so much more is because it maybe comes with a SD card, I really get lost at this point. The one on the front page says 16gb. Is that much space needed to hold DS games? What would be the average amount of games held on one cart, or how many games can be saved to one card? I saw some sd cards on other sites but they were everything from $8 to $45. I really have a lot more questions but I feel getting these out of the way would clear a lot up.