I wouldn't yet, unless you have the current need for something overstable to handle breezy days, in which case you might pick up a Teebird. In all honesty, the distances you are throwing are pretty short for those discs, so you can just stay with what you have while you improve. Most people can drive a putter 180-200 at a minimum, often a lot farther. A Leopard (which is a fantastic disc to be using, btw) can go 250' easy minimum with a halfway decent throw, and pushing it past 300' is well within its range. By going to a faster driver, you won't gain anything at all in distance, and most of them will just behave overstable until you can get some power into them. I'd almost bet money that if you move the other direction and get some good glidey mids, you'll see more distance. Something like a Core, Aurora MS, Skeeter, etc...great discs, various lines, and good teachers.