Thanks so much for all the suggestions so far. There really are some nice prices out there.
I cannot decide if I want to buy a nicer set for mine and give my set of 105 down, or if I just want to get that new 10sp Tiagra set for my son. I would even be happy if I could find a complete 9sp. group for him in the Tiagra...cause I really like my 105...I would guess stepping into some Ultegra myself would be a similar experience to that I am having now, in comparison.