In reply to beer belly:
Scotland Coast to Coast for sure. TGO Challenge is good with excellent organisation but obviously that's out for you this year.
Spend a few of these long winter nights poring over the OS maps and you'll find plenty of ideas.
Check out the bothies on MBA website and make sure you know where all the hostels then link them up for a great experience without having to hump a mega sack for the duration. I'd set aside at least 10-12 days for such a trip.
I've done TGO Challenge twice (back when it was the Ultimate Challenge). Kintail to Montrose was good as was Strathcarron-Montrose the second time.
I still hanker for another crossing probably from Lochailort through Ardgour-Mamores-Rannoch-Atholl-Deeside/Angus.
Maybe next year, who knows?