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If you're going with most compatibility/ upgradability an M4 or AK of some sort would be your best model. There are innumerable options for both of those platforms and offer you a chance to create a gun to your liking. They also offer options from both sides of the Canada/ US vs. Terrorists conflict that's going on now, as well as the old school Cold War and Vietnam War era conflicts to suit almost all your tastes.
I'd recommend G&P for a manufacturer over any other, but their internals do require a minimal bit of work out of the box. So if you can't get that work done, or can't do it yourself, your next best bet is a Classic Army gun.
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