My three favorite stations I have in orbit around Kerbin right now are these three.
Called 'Ghost Station' because I originally started designing this station so I could evacuate it and partially destroy it, leaving it dead and abandoned in space as a "haunted" station, but as I continued designing it It ended up becoming too nice of a station to just let it sit empty in space. It has become one of my most often visited stations. It isn't that useful though (as a result of the original intent of the station.) This is the only station of the 3 that uses mods.
Andromeda Orbital Space Center, or AOSC is the main hub of my Kerbin activities, as it contains a decent amount of fuel storage for ships traveling to other planets to refuel after reaching orbit. This is also where I do most of my science researching as ships drop off data coming back from interplanetary science missions. Its fuel storage tanks detach and travel back and forth to my ore processing stations around Kerbin's moons to refuel the station's storage.
KSS 2.0 is just an experiment with modular stations. This station was built entirely (with exception to the Solar panels and the orange fuel tank), by Space Shuttle, but Its very wobbly though as a result, but its fairly useful. (Sorry its dark.)
I'm pretty proud of my shuttle design, so I'll include that too.