The Mastotron is ace, currently my fuzz of choice. Works very well with bass and has the impedance buffer so is ok with actives too. Can do synthy fuzz to full on heavy fuzz, tiny little box too. Guitar Village currenly do it for £89, that's who i got mine off
Also consider a Russian Big Muff and MXR Blowtorch, although you'll have to use a 9v battery clip adapter with the Muff and an 18v power supply with the Blowtorch, both sound great though and the Blowtorch may be just what you're after. There's quite a few fuzzes you should try out as they're a matter of personal taste.