If the games were played on paper, the Perk/Amare/KG lineup would be killer. Unfortunately, they are not.
I just think people are totally undervaluing what we have here. It'd be one thing if we were the '90s Pacers or Knicks, teams perpetually good, but never great. However, this team has the potential to be an all time great team next year. For goodness sake, we won 62 games this past season without KG for 25 games.
For all we know, Amare gets here and doesn't fit in. You add Amare to the starting lineup, and you lose the ability to spread the floor. If the 6-7 guy (as the OP said) was guarding KG, it'd be way too easy to double KG since Amare, Rondo, and Perk all can't shoot.
For as much criticism as Ray Allen gets, I don't think people realize how much his shooting makes the Big Three work. If it was practically any other star out there, I don't think it works. However, when you have arguably the greatest jump shooter of all time on the perimeter, it makes in nearly impossible to ever double Garnett or Pierce, which really opens up things for them.
With Amare, I'd be afraid we'd turn into the mid 90s Suns with Olajuwon, Barkley, and Pippen. They were good, but could never be great because none of them could spread the floor enough to fully utilize the defensive attention each player got.
Keep the team together. If they stay healthy, the next year or two will make whatever slump they go into after that time worth it.