I'm not sure how versatile it is, but here's what I use:

Above roughly 40F:
Marmot Trestles 15 degree sleeping bag (from Campmor.com)
Exped 9DLX Synmat

Below roughly 40F:
Cabelas Summit -20 degree sleeping bag
Wool Socks - or else my feet get cold
Loose synthetic stocking cap
Exped 9DLX Synmat
Cheap closed-cell foam pad under Synmat