Deep breaths now, relax
Tranman, i would suggest the ''down to Italy and catch a ferry'' route. Seems you've already seen/ridden through eastern europe. Avoiding the sh**ty roads and multiple border-crossings will keep you fresh and ready for the bimble through the coast. December will be a tad wet and rather calm but i guess you'll be here for the scenery and the roads, so no worries. Especially the part from bodrum to antalya will be great. Calm roads through the pine forests with the sea on your right all the way 'till Antalya. And lots of nice twisties may i add. I wouldn't expect much roadworks etc as they start getting the roads ready for the tourist season only from march or april forwards.
Don't know the duration you have in mind but guessing you will ride all the way from cesme to antalya, i would suggest a week or thereabaouts should be the way to go. And shorter and you'll be just pushing through it, missing much of it. Any longer and you might find it's too ''calm'' in December. No visas required for U.K nationals. Fellow tossers of this parish; L and expatinistanbul can also fill you in i guess. A nice thread over in advrider from another Brit actually living down in the southern coast, should give you a great deal of info about those parts:
http://www.advrider.com/forums/showthread.php?t=374143&highlight=turkey