Europe travel package deals

[frosty]

Okay, I'm really going to Europe this year! I originally planned on going to Sweden alone but after talking to someone at a get-together last night she suggested that I try one of those tour package things, which I've considered before but never gace it much thought. Since this will be my first Europe trip and I'm going alone, I figure it's best to go in a group and with a guide. The thing is I don't know where to start or which online companies offer the best deals. Can some of you guys point me in the right direction?

For this sort of trip, is it best to do a 1-week or 2-week tour? Is the price difference significant? I'd love to see England, Germany, Holland, Sweden, and pretty much everything in between. Ah, I'm already overwhelmed! It would be nice to have a travel buddy to help out.