I went through this delima about a month ago. I ended up getting an oconnor 50D head and 25L carbon fiber legs. I think the only manfrotto head that would suffice for an NPR would be the 3274. That 116 head in the ebay listing that you mentioned might break with an NPR!
An Oconnor 50 is rated for 50 pounds, and has counterbalance springs, which is a must with an NPR. Just keep an eye on ebay auctions... Just don't get one with the 'pro junior base' which is the really wide base!