The best all-around bipod currently on the market is probably the Tier-One Evolution bipod. It just offers so much more than even some of the considerably pricier bipods that it really is a great choice. One of the features they added recently are the "sealed roller bearings", as they call them, which allow the bipod to rotate smoothly around the barrel, but that's just one of the positives, really. What most owners see as a big plus is the amount of customization available. The legs can be locked at 45° or 90°, the feet are extremely easy to swap, the legs can be pulled out and back in very smoothly and fast, and the QD system is the same as on their scope mounts, which ensures repeatability.
To sum up: If you're on the fence about the bipod, then the Evolution is a sure bet. It's suited for just about any personal need, and it comes at a relatively low cost.