Personally I wouldnt bother with a tour. My brother spent 5 weeks there last year on his own. Researched on the net and went for it. He is now doing Europe as I type and is in Stokholm. I couldnt imagine anything worse than being sat with bus or plane loads of the same people for 2 weeks.

Research it, ask for info, decide on whats best for you, book it, do it.