Well , for 600 you will get 600 worth of sound,
Save your pennies and pick up a Roland FP-7 >
http://www.rolandus.com/products/productdetails.aspx?ObjectId=856&ParentId=87 It has great action and great piano sound.
http://www.bhphotovideo.com/c/product/480572-REG/Roland_FP_7_FP_7_88_Key_Digital.html Have them e-mail you a better price , or contact Frank V. , see if he is a Roland dealer yet.
If so , you will get a really good price quote

Later

Gary