Realistic Mk3 Stock Space Shuttle! 1.2 Updated!
Set throttle to full and launch this puppy. She auto gravity turns as the solid rocket boosters burn out. Separate boosters, climb to 50km, roll upright, burn through your main tank, use the OMS mono propellent engines to reach orbit and return.
Literally just throttle up and press spacebar to go to space!
Here is a video: http://youtu.be/T99shdw5XN0