In reply to Roberttaylor:
I often do a mid-winter route of -
Sugar Bowl up to Coire an -t-Sneachda, Goat Track, up and over and down Coire Domhainn, up to Loch Etchachan, over the bealach and down Tailor's Burn to the Corrour, then return to the SB via the Braeriach four Munros.
I am no slouch, but it fills two days easily, and is bloody hard work in anything other than perfect conditions. Depends how many days you are happy to be out I suppose.
You also have to consider alterations to planned routes due to avalanche risk.
Tall order if you ask me, but good luck mate, you're much fitter than me, so go for it!