I'd say M57 is fantastic. It has a good surface brightness and looks amazing through my 10" Dobsonian.
M1 looks pretty good from here in Austin. M17 is faint, but can be seen if you are experienced. M27 is also quite good.
M31 is OK, but you don't get many details. M13 is fantastic! I spent over an hour observing it a few weeks ago. The Perseus double cluster is quite good, and so is M42.
Alpha Herculis (Rasalgethi) is a good double star, but requires higher magnification to split than Albireo. Mizar is another good double star, but is not colorful like Albireo and Rasalgethi are. I've caught very faint glimpses of M51's spiral structure, but even the core is very, very faint from here. This one is definitely for larger telescopes only.
For reference, the NLEM here ranges between 4.6 and 5.2. Occasionally, if the night is good, you can catch a glimpse of the Milky Way with direct vision. Otherwise, it is fairly difficult even with averted vision.
I've got a fair amount of observing experience. I've seen the Triangulum Galaxy from a very dark sky site with the naked eye. At the darkest place I've ever been, the Milky Way cast faint shadows on white surfaces, and my NELM was around 7.5.