I would expect you to be able to see the four Galilean moons of Jupiter to be able to see Saturn's rings well enough to whet your appetite.
Jupiter is rising at about 10:40 PM at the moment so if you can stick it out til about Midnight to let it rise decently above the horzon it is well worth a look. It is very bright and easy to find.
For a nebula to have a look at, try M42 (Orion Nebula) it is the middle "Fuzzy" star in Orion's sword and about the easiest deep sky target out there to find, it is visible pretty much as soon as it gets dark at this time of the year. your lowest power eyepiece is probably the best one for that.
As for a good size scope, there are heaps of threads on the forums about that, the general consensus seems to be an 8 to 10 inch Dobsonian which do come up secondhand, as a good blend of light gathering, ease of use and ease to transport (the Dobs are a Newtonian reflector and once you get to around 12" in aperture they can get start to get heavy and unwieldy to move around)
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