My honest opinion, get the x-therm, sell the UL7, and never ever think about the sleeping pad again (until we start seeing 10oz R6 pads).
I used to fiddle around with different pads for different setups (e.g., UL7 for shoulder season, ccf or torso pad only for summer, ccf+neo air for winter) which would leave me with the satisfaction of having saved 2-3 ounces for the given situation, but having caused me to have spent more $ then I needed to and complicating trip planning.
I got rid of it all...I now have a 15 oz x-therm that I use in all 4 seasons now. I have more money in my pocket, less gear to worry about, more time on my hands. That in itself is worth whatever 2-3 ounces I might have saved fiddling with various setups.
I think Eric Chan once eloquently proposed that you could take a piss before your trip and save more ounces...I think this is the only time I've ever agreed with him :)
IMO the x-therm is the most rounded pad in terms of comfort, weight and cost. Yes it's a bit noisy, but if it works for you, it's awesome