I have a Manfrotto 055 tripod with a 115 super 3D head on it. This works out very well for me. I like it because I can control either axis separately.
I also have a 681 monopod with the 234rc head on it. The head works ok with heavy gear. The problem is that you have to support it as its not made for much weight. I wouldn't recommend it for heavy gear.
This is an option. The 393 gimbaled head is made for monopods, but works equally well with tripods. I would have gotten one if I wasn't so satisfied with the super 3D head.
tripods, heads, monopods, light stands, camera supports, lighting supports, professional tripod 393 - HEAVY TELE LENS SUPP.F/MONOPOD