No need to spend that much cash on such a simply built peice of equipment.
Go to High Tech Garden supply aka HTG & get a ballast from them,they have great build quality,they are UL rated & long lasting,they also have a 5 year gaurantee.
Ive got both magnetic & digi ballasts from them,i run 8 of their 600 watt swithable/dimable digital ballasts & 2 of their 400 watt switch & dimable digi ballasts,these units have operated non stop for the last 2 years without so much as a bad cord,its been problem free.
I also have 4 of their 1,000 watt magnetics that ran non stop for 3 years i no longer use,i never had a problem with those ballasts either,their still working if i plugged em in.
HTG.COM is the ticket & their ballasts are every bit as good build quality as lumatex ,at 30% less cash.