You sure you need one of those? What you've got should be relatively easy to handhold unless you intend on holding it up for long periods. In comparison to what most put on a monopod, you may not find much occasion to use something like that, especially if you already have a tripod which would be steadier for low light or long exposures. Might want to think more in terms of buying a remote trigger if you don't already have one. If you're really determined to get a monopod though, there are lots of models out there. I'm not a huge fan of Manfrotto's flip lock mechanism, but many are. Manfrotto makes several monopods, both carbon and aluminum; aluminum, of course, being cheaper. Believe it or not I still use a Chinese carbon monopod I bought off of Ebay for $80. Lots of other makers abound though - Benro, Induro, Feisol to name a few. Gitzo and RRS are the gold standards in all things tripod or monopod, but their prices are known to make people gulp.