I too am a side sleeper and also toss and turn a bit. I have a 20 and a 50 degree rated Enlightened Equipment quilts. Together they are rated down to 0 degrees F. I feel this will give me relative comfort over a wide temperature range. EE has some nice charts on temperature ratings when combining their quilts. I was going to go with 950 down on both but they suggested making the 50 degree synthetic as the weight and size penalty was minimal. The total weight of the quilts is just over two pounds, something like 34 or 35 ounces. I use a NeoAir XTherm pad, a tent, and of course clothing to supplement.

I tested this out a couple months ago on a trip to Alabama. The forecast was for 35F at night and I slept in a low area next to a small water fall so maybe a little cooler. I used only the 20F quilt and was quite comfortable.