HOw about this? You should consider the DGX-505 for the weighted action and if you just need sounds really and maybe some groove or arpeggiating features, check out using a Korg Triton rack... you can MIDI them together and basically have an 88-key Triton.

Jeff
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Musician / K-6 Music Teacher

Dodge City Schools -USD 443
Forte Music School

http://forte.musicteachershelper.com