Hi, everybody! I am an adult beginner. Want to make sure I do not get a cheapo. What would you recommend: new KORG LP-350 $999, new Roland F-110 $1250, new KORG SP 170 $500 ,used 2 yr od KORG EC-150- $600, used 2 yr old Kawai CN 21 $800. Anything else you would recommend? How risky is buying used? I like Yamaha YDP 181 $1600, but not sure if I can get a good value without spending this much. I did not like any of the Williams, Celviano and such under 1,000.