mag322

hi there , im a nobrainer in tec ;-) so i need some advice first do i gain anything if i change my mag 254 to 322 ? i have an old linksys ea2750 and whant a knew , but im stocked in reading "best in test" so any recomadations for a router to iptv . my connetion is 300 Mbps down and 15 Mbps...