Just to throw in another option:
- choose the exchangeable plate well - I had a lot of RC4s just before I bought that head
- and is not too compact/light at 730 grams
I had the linked 468MG hydrostatic head for a while, definitely a nice head (arguably the best of the Manfrotto ballheads).
Regarding choosing the QR plate well, best advice is to NOT choose a Manfrotto plate at all. The RC2 wiggles in the locked clamp, the RC0 and RC4 don't but are bigger than the bottom of the camera, and way bigger than a lens collar foot, so they stick out and get in the way.
Whatever head you choose, get one that uses the Arca Swiss-type plate/clamp system. (For the Manfrotto 468MG, get the head with no clamp and add a Wimberley C-12, Kirk, or RRS clamp...but for that price I'd say just get the RRS BH-40 LR).