As far as the sage rods go, I think you are missing their point. They are not for guys who want to fight the fish. They are made to be tournement legal and are extremely stiff for landing big bass in seconds. The heavy lines are required to load a rod that stiff and to throw giant flys.
As far as rods to use for fun, it realy doesnt matter. I use an 8wt becouse I throw big poppers and hair worms that would be imposible for me to cast with a 6wt. And I have found that the fight realy isnt that much less with an 8 than a 6 of the same action. When I go back home to the Elk I use a 9ft 4wt and have tied flies for the rod. Crease flies are very easy to cast and catch smalies like crazy!
If you can afford it, buy all sizes of rod. If not, dont worry about it.