Hi Hasko,

What are you looking to do with the keyboard? Are you looking to create songs? Are you looking to just play around and have fun at home? If this is what you want, I think you should stick with an arranger type board as opposed to an older performance synth. The D70 as I understand it is not GM compatible. I'm not sure how many parts it can play at one time either. If you are wanting to play synthy sounds in a band live, then maybe the D 70 would be your choice. The casio wk3000 is a decent home keyboard for puts'in around and perhaps to some a degree even for writing. It's certainly fun to play. I had one. Plus I think the samples (sounds) in the wk300 are going to be more realistic then the D70. I don't think the wk300 has a line out for an amp though. So playing with others in a band may not work . The wk3500 has a line out I think.

For someone new to MIDI and keyboards in general the Casio and Yamaha lower end products tend to be very fun. I think the D70 has a more restricted, specific purpose.

Best wishes
Bob
<><