Yes, it would definitely be a good combo.
I was planning on getting the RRS PG-02 FG, but the guys from RRS recommended the PG-02 LLR instead. I really like the side mount option - lighter, faster to assemble, easier to reach under the lens for access to the MF/prefocus rings. I'd recommend getting the RRS replacement foot, too.
I also went with the RRS TVC-33 legs, which are excellent (but more $ than the Gitzo, especially with the rebate). I'd consider a leveling base for the legs (Gitzo makes them, the RRS leveling bases also fit Gitzo legs). With a ballhead, you don't need the base level, but with a gimbal a level platform means level panning, and leveling by adjusting the legs is a serious PITA.