If you are going to keep the car for a good while, I would do the head. The seals, at that milage, would be a temporary fix.
It sounds like you are determined to do it yourself. Well...try it. Take out the head and send it to a machine shop to rebuilt it. In the meantime, change the rest of the stuff you want to do.
I am a DIY'er and I love to work on my car (not to mention the money I saved) but, I know my limitations.
The inside of the engine and the transmission is a BIG NO, NO for me. Everything else is fair game...
Good luck to whatever you decide to do to YOUR car!