I'm not sure if you are wanting a midi keyboard (of the musical variety) or a keyboard of the inputtylettery variety!
If it's a midi keyboard for creating music you want then i can highly recomend getting a Roland JV-30 and a usb midi interface. I don't think roland make the JV-30's anymore but you can get a second hand one for nice round £100 these days.
Regarding inputtylettery variety keyboards i dunno about them that much i just type on any that i have lying around!
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