Thanks all for the great input. Don't get me wrong - I prefer to climb in leathers and/or softer shell boots, but have generally done Rainier in plastics when I'm not in the cattle trail. There will possibly be a good path up the Emmons by this weekend, but I haven't been up there to see and haven't seen any posts about it. With the forecast for this weekend we may spend a couple days in a tent anyway.
IMO the Trango EVO S is not in the same class as the Freney XT.