I think that the Bell Mafia influence is way overstated. It's one of those "post-hoc ergo prompter hoc" situations. Are Bell helicopters used in the Marine Corps because Marines are on their boards or are Marines on the boards because the Corps uses Bell helos?
The V-22 could be argued back and forth all year, so I don't want to beat that any more than it has been already. Suffice it to say, I'll be starting in the sims for it next week, so I'm biased. The Huey beating the 60 is a function of commonality first of all--the UH-1Y will use most of the same parts as the AH1Z. Also, the Marine Corps doesn't see the "bulk discount" savings for adding its requirements to the overall DOD purchase of 60s. So, even if the 60 is cheaper for DOD, a rebuild of the Huey still comes out cheaper for the Corps. Since we're in for the Huey, the parts commonality works for using the Cobra, too.
I'll second the critique of the Apache as being built for the defense of Western Europe. It has an unmatched ability to deliver anti-armor ordinance. It is not well suited against troops. Its ability to deliver running fire is poor, and the reliance on just a FLIR vice goggles for night vision means the aquisition of small targets, e.g. people while on the move is bad, since the FLIR slew rate is very slow. Its avi package and datalink ability is impressive, though, and is probably the only thing we should envy in it.