I have been using Alan 456R for the last year. They are about £50 each, tough and give good clear communications between bikes. As they can use AA dry cells as well as rechargables its easy to stick some dry cells in if the batteries go flat.
It's debatable whether its worth buying the Alan charger. It's convenient to just drop the radios in but it comes with 700mamp ni-cads and although they last a day or so with reasonable use I tend to use 2000mamp Ni-Mi and a standard charger.