Axiom Home Page Forums General Discussion Advice from Axiom Owners Upgrading from Advents to M3's?

Just bought a new HD screen and now thinking of a 5.1 system for a 14' x 18' living room for music and videos.
Presently have 2 Advent 3002 (1978) speakers with the following specs: 8 inch woofer/ 1 inch dome tweeter/ 48 hz-23 khz, +-3db
88db sensitivity, @1 watt, @1 meter/ 2.8 khz crossover/ 8 ohms/ Walnut grain cabinet/ 20x12x9 inches

Thinking of getting: 2 M3's, VP 100, 2 QS4's, EP 125.
New not always being better,and outside of buying and comparing, how would the new M3's stack up against the older Advents as both having similar specs. Should I build around the Advents which still sound great?