You might be able to get by with a cheap one since your BH6 has voltage adjustments in the Bios but I would'nt recommend it.Don't skimp on the slotket get a good one like the MSI MS-6905 Master.
A cheap slotket can greatly affect your overclok & possibly hold you back.Also on my BH6 I could only go the 1.70volts with the slotket votage set to default.I had to raise the slotket to 1.65 as a default which then gave me higher adjustments in the bios up to 1.9 volts.
Toro