Have a look at the DGX-520. It's not fully weighted, yet still has 88 keys. If I had my choice of this unit over the 505 I'd take the 520. Here's a link:
http://www.yamaha.com/yamahavgn/CDA/Cont...D205200,00.html

If 76 keys are enough you may want to consider the unit I just got. Check out the Yamaha NP-30. Supposed to have the same sounds as the P series. It has 76 graded (semi-weighted) keys--this keybed is new and exclusive to the NP-30. The unit has a total of 10 sounds. It can be bought for $299.00 new. A very good price IMO.

[This message has been edited by squeak_D (edited 08-06-2007).]