The Mirage F1 is basically 4 modules in one (once the F1-M is done) so bang for buck is big.
Mig-29 may seem awesome, but early access is bound to have bugs and it could just collect dust due to frustration.
I don't own the F14, I trial it every so often but have not purchased it.
I'd say if you want to do naval stuff, F14 otherwise Mirage F1