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Thanks for all the responses. The 290 seems the go then.
I am currently using an SBIG STi guider which has a mechanical shutter which is handy for doing autodark subtracts. I don't use PHD2 but have in the past.
I don't think the Sky X will allow me to use a dark from a library.
Is the 290 pretty clean without it? I am not worried about a few hot pixels, I am more concerned with white bars, interference patterns that can be confused with the guide star like I had with an SX Lodestar.
I get guide stars resonably easily in most situations but there is the odd one where its hard. M104 comes to mind as an example of no nearby guidestars. 80% QE would help there.
Greg.
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