Plunk down the money for the one piece suit - I lived in mine and loved it   You can now ditch the fleece pants (heavy and bulky), especially if you're bringing another pair of insulated ones - your boots come nearly up to your knees anyways.  Consider leaving the belay jacket also.  When you're moving it will be too warm, especially with a big pack on, and you already have the softshell and gtex.  When you're stopped, just throw the big parka on (Nautica...?).