The Roland KF90 is definitely really nice http://www.rolandus.com/PRODUCTS/CK/naam_w01/kf90_b.htm
and certainly slimmer and (more portable) than the PR703. Unfortunately the KF90 doesn't recognize jazz chord voicings (rootless Bill Evans style), the Technics PR-703 DOES! I personally prefer the Technics piano sample & key feel over Roland's.