Which one is better in your opinion? i work with reason in the bedroom and i have an SP-505 which i use out in the living room (I work Late and by the time i come home the wife is sleeping lol)....Should i stick with the 505 or get the 606....the 606 is not really that expensive on Ebay and i love the fact it has a 4x4 layout like an mpc....feedback appreciated.