Good Ballhead for lightweight Travel Tripod?

[rocketdesigner]

I am ready to pull the trigger on this Sirui CF tripod for travel:

http://bhpho.to/Jsn81a

Could anyone recommend a durable, yet lightweight ballhead?

I do have a small fortune invested in Manfrotto 501 QR ... would there be a Manfrotto ballhead that would meet my needs you could vouch for?

Thanks in advance for any advice.

 

[arcanej]

I bought the Sirui T-1205X. The sales rep at B&H recommended the Joby Ballhead X. I've been using it for a few weeks and don't have any complaints.