Also consider this as well. The PSR-3000 has 61 (non-weighted keys), and the SK has 88 weighted keys.

Sure the feel for playing the piano/electric piano voices are going to feel and play much nicer on the SK, but take into consideration other voices on the SK.

With weighted keys it's much harder to play other voices that require a quick, and fast key return--such as manual drums for style recordng, and fast solo instruments such as guitar, sax, and a few others.

Regards,
Squeak