You could either have an apple phone and work with all other apple devices.
You could have a windows phone, use a windows computer and go with the facebook microsoft is developing.
Or you could have an android phone, use google(-mail) and go with google+.
I think it would be really practical to have just 1 company run all your things. That would mean everything is compatible and on-the-go.
It's just a matter of time before you can't switch as easily from one thing to another, now is the time to make your mind up and switch to 1 company.
You can't just have an iPod that you sync with your iTunes at home on your windows computer, while you use 'normal' mp-3's on your telephone.
This is the time to go to one standard, that'll be settled in the next 5-10 years.
I started with
chute, pod, s.a.s, decoupler, 2x fuel tank, liquid engine, decoupler, tricoupler, then underneath each 2 fuel tanks and a liquid engine.
From that on I slapped on solid engines and extra s.a.s units, which made thing go slightly faster, but it's good to start with.