I used two of these contactors to control my hydraulic pump:

http://www.bandc.biz/bandcstartercontactor12v.aspx

When I was building my Legacy, people were reporting failures of their contactors and I searched around for a more durable one.  B and C said that these were probably overkill, but much more durable than the cheap ones. Six years and 600 hours without a problem.

Dennis
Legacy 600 hours