Antec, Delta, NMB, PC Power & Cooling, Zippy all make Thunder powersupplies. Enermax has been saying they have one coming but they've said that for 5 months now. The Antec model is
here but is not available for sale yet. The Delta, NMB, Zippy and PC Power & Cooling is available now.
The PC Power & Cooling is a great choice but it is $225. Most people are using the NMB but there have been a number of reports of quality problems with the. The Delta supposedly is hard to find in the US. I've never seen a Zippy for sale either but I haven't really looked for a few months since I got rid of my Thunder.