Help me find the right keyboard?

I posted the question "I'm looking for a keyboard..." in Entertainment & Music > Music > Other - Music and the only answer I got was "ok thn search for new technologies keyboard from net and it will easier 4 u dear..ok". I have no idea what "new technologies keyboard from net" means, but I was able to gather that she meant I was in the wrong category. So now I guess I have to find the right category, but there is no Music Gear category. What should I do? I need a keyboard with a vocoder, at least three octaves, and easy to use preset ons. Digital or og makes no difference to me. Ideally I'd like to be able to press a big preset on for a pad sound, hit another one for the exact vocoder I want, then hit another one for a nice sawtooth wave sound. How in the world wide web do I go about finding it?