I use an Acratech and it's fabulous, locks solid, doubles up as a casual gimble head (maybe not for super teles, but fine for the 70-200 2.8 IS II http://acratech.net/product.php?productid=76
I have it on a 3 legged thing Brian I think, saving for a nice gitzo too, and the acratech wil be going on that. If you like panorams the acratech has a facility for you to reverse the head and use the ball head like a levelling base. Unsure why these aren't more popular, it's the only ball head I've had where the tension facility actually works.
I use Sunwayfoto plates, I have the 5D3 dedicated L plate and normal plate, fantastic, about as good as it needs to be, can't see the difference between them and the more expensive brands.
I also use one of their mini clamps on a Joby sling strap and they are superb, not too pricey either, about £25 ($40) and terrific quality well up to weight of 5d3 and big 70-200.