Hello I need to upgrade my RD-500 and have been looking around Korg, Yamaha and of course Roland. I have narrowed it down to RD-700GX and RD-300GX but I cannot make up my mind which of these two to get. I can afford the 700 but obviously if i can get away with just the 300 thats great. What are peoples thoughts on these two keyboards though? Any help would be appreciated.....