if you desperately want a scope then $400 will get you a good condition used skywatcher ED80 refractor. Much better optics/faster than the ebay one, and better for astrophotography, or even to use as a guide scope down the track. BUt of course at some point you are going to need a mount to put it on....
So, probably the best advice is to use your $400 as a good start towards saving for a decent mount that will serve you for many years. By this I mean something like an EQ6 or maybe a Losmandy G8 or G11. Once you have got your mount, you can stick the camera plus telephoto on it and do wide field stuff until you can afford an imaging scope (plus all the other inevitable bits and bobs that you will find you need....)
I followed a different path, and now own an EQ5 which I picked up (2nd hand)for $250, and an 8" reflector that cost me $280 - also 2nd hand. If I had my time again, I would have got a bigger mount and a smaller scope - rather than the other way around - much easier to learn when you are not at the limits of what the mount can handle weight-wise.
Bottom line - try to purchase things that are good quality, and are adaptable to a couple of different jobs - like the ED80 doubling as an imaging or guide scope. It is a false economy to buy cheap stuff that you will regret buying in a couple of months - ask just about anyone on this site....!
If you spend the money on decent gear, you will also be able to sell it easily if you find that imaging or astronomy in general is not for you, and not be too far out of pocket.
Good Luck
Adam
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