Firestorm, I'll take a shot at this. Let me first say that it really depends on what else you have and what you plan to do with your rig.
Originally Posted by Firestorm
I don't know what I'll think when I'll plan to purchase one of the three keys in the topic..
Some users can explain me some + and - about:
:: Acoustic Sounds - I really like the Motif's acoustic sounds.
:: Synthesized Sounds - I really like the Motif's synthesized sounds (in rom)
:: Polyphony - I really like the Motif's increased polyphony. Despite the clever voice stealing algorithm in the Kurz.
:: Technology - I really like the MLAN option and plug-in options in the Motif
:: Controls - I really like the Control environment in the Kurz synths, the ribbons, the ability use FUNs to scale controllers and so on.
:: Programming - You can do a lot more with VAST than you can with the unexpanded Motif. The Motif does have the plug-in boards (Analog, FM, VL and vocal harmony among others). Each of these do some things that the Kurzweil cannot. However the K is semi-modular and you can blend sounds pretty well. Additionally KDFX ( in the 2600) is miles better than the Motif. You can use it in live mode as a programming plug-in.
:: Live Performance and Improvisation - I like the controllers on the K. I don't use arpeggiators and stuff like that much, live.
:: Quality / Price - I dunno. The Motif ES is going to be superceded soon. The K2600 may be the last synth the company makes. Reliability could be an issue for both synths under many scenarios. The Kurzweils are being discounted heavily, so if you are a value buyer, I'm sure you are tempted. I know I am. I'm not aware of any deal breaker quality problems. Some have had problems with the K action, but a lot of that has been due to playing them with bad supports, storing them incorrectly. Whatever you get, something could always go wrong, and you may have to fix it.
:: 61, 76 or 88 keys? If you are a pianist by training and this is your primary board, I would recommend 76 or 88 keys. If you already have an instrument to serve as a piano action, it may make sense to get a lighter board.
Others may have different views. This is just my opinion. BTW, any discussion of the Motif ES and the Kurz should probably include the Fantom X and the Triton Extreme. I know they have joysticks but you could get used to them...