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Firstly as far as the Saxon goes I don't like the single arm mounts -not really designed for photography through a telescope - with just a camera lens I think they may be ok, but the extra magnification of a telescope will show up errors in the mount and you'll get stars which aren't round.
The astromaster looks like its on an eq2 mount - not very sturdy - at the minimum you need an EQ3. (others will say you need even bigger).
Andrews comms (check links section) has a similar scope for $299 (skywatcher or guan sheng) i think..i would maybe ook for a mount like the EQ3 or guan sheng SV1 as a basic starter mount. Keep in mind even with these usually 30sec is the limit of them without adding an extra scope for guiding which these mounts could not support.
Add a motor drive to the mounts for tracking.
For planetary images people use a ccd or webcam. For other deep sky objects use an slr or ccd (though ccd are expensive
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