I have been playing with a team of 3 barbs and 1 wd the last weeks trying to come up with a pet oriented build for s3. I would avoid the raekor set and using charge when multiboxing since at least for me it is a bit chaotic. I leveled them from 1 without paragons just to see how leveling for s3 will be and it was rather easy and fast without any actual problems. However, my demon hunter group leveled up significantly faster. Overall the leveling speed was satisfied me and i still intend 3barbs+1wd to be my team for S3.

On the other hand if you only box 2 barbs i think it will be easier to use charge when you get used to it. My advice is to try them now, before the start of season 3 to see if you like it. Also, if money is not an issue i would go to a 4man team instead of 2 since it is much more fun, xp is a lot faster and you can gear up your main a lot quicker.