Legs: Gitzo or Really Right Stuff. The latter is more expensive, but the quality can't be beat. I have their travel tripod setup (TQC-14 and BH-30 LR), leg diameters and support rating are equivalent to the Gitzo 25xx, and even though it's rated for 25 lbs, I can (and have) personally suspended myself (180 lbs) holding two of the legs and swinging under the tripod. The RRS TVC Series 2 is similar to the Gitzo 3-series. IMO, the build quality of RRS is slightly higher than Gitzo (anodized vs. painted aluminum parts and easier-to-hold legs locks, for example). But really, you can't go wrong with either Gitzo or RRS.
Head: RRS, Kirk, or Markins. I'd avoid both Gitzo and Manfrotto. The Gitzo heads have a generally bad reputation for a reason - they're kludgy and relatively heavy, and use a non-standard plate. There's a guy on my local Craigslist that's been trying to offload a Gitzo head for over two years now - no takers. Whether you get the Gitzo 25xx or an RRS Series 2 set of legs, I'd get the RRS BH-40 head.
I used a Manfrotto 468MG ballhead for a few years - the poster who commented it's a joy to use is correct. The head is a joy to use. The RC2 plate/clamp system is not a joy, IMO - it's the weak point in an otherwise quite decent system. While it locks down securely (thanks to the secondary pin, there's no risk of it slipping out), even with it 'locked down' there's still play - and that means vibration, and also makes it difficult to precisely position the load. Fortunately, the clamp can be switched. I removed the Manfrotto clamp and replaced it with a Wimberley C-12, an Arca-Swiss type clamp.
I highly recommend going with the AS system - the clamps are secure and it's as close to a standard as you'll find (used by RRS, Kirk, Markins, Acratech, Arca Swiss, and others). You can get excellent Kirk or RRS L-brackets, specific or generic lens plates, a variety of pano systems, etc.
When you add the cost of the 468MG (you can get just the head without a clamp) to the cost of the Wimberley C-12 ($80), you might as well just get the RRS BH-40...