don't forget you need to buy the filters as well (and filterwheel - although QHY9 comes with a filterwheel)... how does that impact your budget?
if the camera budget was around $3500 (without filters/wheel) what about the atik 460 or QHY22? with the awesome ICX694 chip?
Another option is in the meantime to buy a Ha filter and use it with your existing cam.
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