For birding, I'm not a fan of three support feet. It's a good feature for shooting videos, but it's more a hindrance than help for birding, adding unnecessary weight. I'd second just getting a P424. For the head, although Sirui L-10 Tilt Head is an excellent choice, I do use and prefer Sirui L-20S 2-Way Levelling Tilt Head for my Gitzo Monopod. Most would say you only need the tilting head, but in my experience having the additional panning feature allows a Gimbal like action -- for $35.99 more. In fact, I did purchase a Gimbal head for my monopod, but it's now exclusively on my tripod since the L-20S on my monopod works just like a Gimbal minus the weight. It's a real pleasure to use for birding or air shows. An additional benefit of using the panning feature is that the monopod rubber foot doesn't wear out by constant side-to-side action or, if you're using a steel spike foot, a far less chance of losing it. With the panning feature, the monopod itself doesn't move side-to-side, preventing any wear or twisting off.