The MW6 has Gigabit ethernet and the M3 has regular. For future proofing it i would go for the MW6.I can get the Tenda Nova M6 for $180 from US. The Tenda Nova M3 is available for $130. The RBK50 and Deco M5 are way too expensive.
Any idea how much better is the M6 compared to the M3?