I really prefer a deployant buckle over the standard type not only because I find them more comfortable, but they prolong the life of the strap. The strap on my Zenith is the nicest OEM strap I've ever had on a watch and after wearing it twice with the pin buckle, I set out to see if I could find a solid rose gold deployant.
I found Igor at A Fine Watch BucklesDeployants and had him build my deployant. He will do an all gold one or one that's a combination of stainless steel and gold if you want to save a few bucks. Since mine needed to be rose gold in order to match my watch, he suggested that I send him my buckle so he could be sure of the match. So I sent it off to Las Vegas and about 10 days later, I received my matching 18k rose gold deployant. It's a perfect match.
Not only is Igor a goldsmith, he's also a watchmaker and has watches listed on his site as well. He was super patient, answered all of my questions, and was great to do business with. Deployant pricing isn't static as it follows gold prices, so you'll have to get a price from Igor shortly before you're ready for him to build yours.