Well friend there is nothing wrong with the 7mm Mag. But if you're wanting to be a one rifle guy (which is ok too) then you should either stick with your '06 or go with a 300 mag.
I'm not down playing the 7mm mag but your '06 can handle just about anything. And if you ever get enough $ to go for big nasty bear, then a few buck more for a bigger (338 and up) rifle will be no problem.