Replying to Tripod heads. Manfrotto 128-RC or Gitzo G2180

I'm thinking of getting the Manfrotto 128-RC for £62.23. Is it worth buying the Gitzo G2180 for £204.95? If there's something you would suggest instead, please do. I've got a Manfrotto 055-XPROB tripod and I will be using it for filming, which I why I'm just looking at fluid heads. I want a quick release, so I can swap my camera onto my glidecam quickly and easily and there don't appear to be any in the manfrotto range with quick releases, stocked by my shop, between these two prices. I don't really know much about heads, so I don't really know which of the other companies are worth looking at.