get yourself a 20 degree uq for the absolute low point, and stick with a similar temp range for your tq with what you currently have...Or get a 0* uq and tq, use the syn bag during warmer months, use the 0 tq during cold hang in the mts.
These are my thoughts. I have similar intro gear to yours, but no need to upgrade in the near future. good luck on your decision. It is a toughy...
"We do not go to the green woods and crystal waters to rough it, we go to smooth it."- G. W. Sears
My forum name is Fish<><; I'm in the navy; and I hate sleeping on the ground. If I didn't need ground to walk on or measure resistance to, I think I could happily give it up.