If you had to buy another (which you wont have to) the best PSU manufacturers in reputation are probably Seasonic, Corsair, Antec and OCZ. (I am biased toward corsair because i have one)
Among these brands you would want to pick one thats very high efficiency and has a high amperage on the +12v rail(s). Picking a higher wattage unit than you need will make it run slightly more efficiently.
Thermaltake has a bad reputation because they make some very cheap and low efficiency models, but they make some good models too-- like the one you have.