What HQ to take for my 1500pts codex Space Marine army list
Captains and Masters are OK.  They are good at combat, but they don't really do anything to support the army.  They make a good second HQ choice unless you want to run bikes as troops.

Chaplains can boost a single squad, but he'll really only get one or two opportunities to earn his points.  

Master of The Forge can be good, but he can get pretty expensive and never is quite as efficient as a Captain or Master.  Take him only if you want to run a list with 6 dreadnoughts.

The Librarian is the best generic HQ option for this list. Join him to the Terminator Squad and he will be protected by the independent character rules.  I'd personally just run him in power-armor to save on points, but Terminator armor with a storm shield is also a good setup.  Power-wise, I'd give him Null Zone and Gate of Infinity.  Gate will allow him to move the terminators around the board and Null Zone will help against any annoying invulnerable save death star units

If you want a good special character option to run with your list, I think Shrike would be the best fit.  Infiltrating fleeting terminators or assault squads can be lots of fun.