In the states anyway, the 2 top contenders are Kreg and CMT. I'm hardly authoritative, but I have the Kreg and it's really nice. Does everything I need it to do. I hear the CMT is equally good, and might be a little cheaper. (It is here, anyway.)
I'm told that Kreg and CMT are run by 2 brothers... but I don't have independent verification there.
The CMT P/H jig is not on the market overhere although it's only been released recently in the States if I'm not mistaken. www.brimarc.com are now the importers for Kreg in the UK. Other options are Trend and Axminster's own version. Personally I'd go with a Kreg product. Most P/H jigs are expensive for what is essentially a simple plastic/metal jig and stepped drill bit. I like the Kreg Pro Kit which, on a bang per buck basis, would be my choice, about £82 odd.