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Hi,
in my opinion, its very difficult to get an imaging setup for that budget as there are quite a few things involved.
most important is the mount.
should ideally have the following
load capacity of atleast 8kg's
autoguiding interface port or support software guiding
without guiding you'd be limited to 1 or 2 min exposures which won't yield much.
The eq5 with goto or heq5 would be ideal but second hand, they cost upwards of $700. not sure if the ioptron packages support autoguiding but look at other brands as well.
scope
to keep weight low (heavier gear requires a robust mount), you could look at the skywatcher ED series, again they cost $400 and upwards second hand.
or a second hand 70mm William optics or similar.
you'd need a semi-apo or an apo to avoid Chromatic aberration or colour fringing, so I'd suggest avoiding achromats.
you'd need a guidescope, lot of people use finder guiders where the 50mm finder scope is used as the guidescope, that works well.
but you'd need a guidecamera that's sensitive enough to pickup guide stars.
you could use modified webcams, but better to use a qhy5 or orion SSAG.
you could add RA motors to a cheap EQ mount to get some good widefields, or even some short exposures with a refractor and a camera but with refractors at F7, you'd need autoguiding for more than 1 min.
have a read through some of the threads in the beginners section and you'll get an idea.
keep an eye out in the classifieds as bits and pieces come up with some good prices.
planetary with a dslr at prime focus doesn't work too well, you'd need a decent barlow and a planetary cam capable of decent frame rates, you can then stack individual frames.
Focal length for nebulae are ideally below F6, else FOV would be too narrow.
For planetary, they go up to F22 with barlows, so you'd need atleast an F6 or F7 to start with, else the object would be too small.
look up philips toucams, quite a few good planetary images taken with them.
you can see how it all starts adding up.
I'd suggest starting with looking for a decent mount, then think of the scope, guidecam, accessories like dew heaters, right angled finder, eqascom interfaces etc.
good luck
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