The simplest would be for you to call Axiom and ask how much the shipping back from your place would be, I suspect it won't be too bad as Axiom has special rates from Purolator. Order just the M80s for now and listen to them. If you find that you like the Tritons better and that they're worth the money, simply return the Axioms. It is cheaper to return 2 speakers than the full system in case you're not happy. So compare the mains and build your system from there.

Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."