The Now Browser is one of the slimmest for Android phones. It is therefore the fastest and the lightest of the lot, while giving full featured access to the web.
It has clocked double the speed scores against the more popular Chrome Browser by Google and it does not compromise many of its features. You get powerful tab browsing, navigation gestures, and much more. For a small payment, you also get in-built support for flash player, compression technology to minimize your data usage and some interesting Java tweaks.
Try it out, just for its speed and proceed to uninstall all other browsers on your phone !