If you have no experience with jets whatsoever then I cannot recommend the F-5 Tiger enough. Of all full fidelity modules out there it's simple enough to make for a great starter jet.
NTTR isn't worth getting I don't think since multiplayer servers mostly run either Caucasus (the one you get for free) or the Persian Gulf.
If you don't think that you need to start your jet adventure with something easier like the F-5 and you want to just dive straight in then just get whatever you like, be it a Harrier or anything else really.