Dan: I did the same last year--picked up a used Klim 2-pc suit from ADVR and sold my AS onsie, also purchased used from ADVR. I did 5800 miles last spring from Cinti to CA border, meeting up with some friends in Dallas and NM along the way, then back east across southern UT and CO. Rode thru temps of 108* across west TX and temps of 28* and sleet near Bryce, a couple of frog stranglers in CO and and snow near Cedar Breaks, UT. Never got wet, was able to keep "relatively" cool in the heat (Hey, 108* is just plain f'n HOT!!!) with the vents open and stayed pretty warm thru the 28* sleet in Bryce NP. I did carry a thin thermal underlayer with me from UA to put on when temps were below 40. If your gear is of the same quality as mine, it'll serve you well in a wide range of temps and precipitation conditions. You should be good to go!
Have a great trip and post lots of pics for us homebodies.