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Hi Stephanie,
For what it's worth I have, and wouldn't part with, my 800mm f4 Newtonian. You do have to add the cost of a good f4 coma corrector, like the skywatcher f4 Aplanatic coma corrector and some collimation tools but you get to collect data quite fast. You could look at a 6" or 8" GSO scope to save some money there too. Regardless of Newtonian, you will need a coma corrector, and i think a good quality one will last a long time & through several scope changes.
Caveat: I did have photography experience prior... if you're new to photography, a refractor is regarded as the easiest to start with.
To answer your question though, have a 60mm f4 (240mm focal length) SVBony Guidescope. Works well enough. Rule of thumb is your guide scope focal length should be no less than 1/4 of your main scope focal length.
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