Since you have the Ketron have you thought about going with an 88 key controller. You will probably save a bundle. Here's a piano/controller combo that looks nice, with weighted keys. Might be worth checking out their demo sounds.

http://www.m-audio.com/products/en_us/ProKeys88.html


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Psalm 57:7 My heart, O God, is steadfast, my heart is steadfast; I will sing and make music.