/ Advice - Decent four season synthetic sleeping bag....
keep upping the adaptability and try a +5c rated synthetic with +5c rather down bag - covers all your bases and warmer in winter than a single either down or synth (deals with moisture better, traps more dead air).
a few nights a go i used just this to about -10c and spilled about 500ml of water onto it - would have been nasty if just a down, but the synth handled it nicely, and much warmer than just a synth alone.
Starlight has a comfort rating of -5 degrees, -12 from the looks of it for lower comfort limit..
I've heard good things about the MH Lamina -15
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