I have a Yamaha CK61, and I'm absolutely delighted with the interface and sounds, but I need 73 keys because I don't like having to play with the octave up or down button. I also have a Korg C1 Air with weighted keys, so I don't see the need to go for a CK88, CP88, or YC88. My dilemma is as follows: should I keep the CK61 and buy a CP73, or should I sell the CK61 and buy a YC73? I'm not a very skilled Hammond organ player, but I must admit I really like the CK61's interface. Can anyone tell me if the piano sounds on the CP73/YC73 are better than on my CK61? I know the YC73 has FM synthesis, but I'm not a big fan of DX7 sounds either.
On the other hand, what is the typical product lifecycle for Yamaha CP or YC? I ask because I understand that after releasing the CK series, the CP/YC range might become somewhat lacking, and I assume Yamaha will try to introduce something of higher quality into the market. Does it make any sense?