Erik
Two fine choices in the 75 and 76 Sets. While I might favor the 75 Ribbon design a bit more, its hard to ignore the stronger Rookie Crop in the 76 set.
Being a hugh Cowboys and Roger Staubach Fan from the seventies I have work tiredlessly on my seventies sets over the years to maintain high quality sets of the decade, the 75 and 76 included.
I will say that I kind of lend more toward the 76 set, as I have worked much harder on that set than I have the 75 set. Either way you can't go wrong with either choice.
Once I get all the scanning done I will be offering up some higher grade cards from both sets.
John