Tony, I'd vote for a dedicated planetary cam...they're more sensitive and support much higher frame rates.
Also, don't get caught up in the powermate slippery slope...sure they're nice, but a good barlow will do just as well with a planetary cam as the sensors are so small...shouldn't have to worry about CA across the field!
Personally, I'm a big fan of the ASI224MC...it's OSC which is easier to use. The ASI290MM is also a firm favourite of those more advanced than I...
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