Steve WA1QIX mentioned a new FET on the AM Forum board recently – the CMF20120D silicon-carbide 1200 Volt MOSFET:
http://amfone.net/Amforum/index.php?topic=27328.0
I have been inactive on this board for several years, but I try to keep an eye on new FETS. Here are some other newer FETs of the last 2 1/2 years or so that may be appealing also. They are normal price range and all three of these are 600 Volt
N-channel power FETs, TO-247 style of package, and have “good drive efficiency”/low gate charge for their size:
ST STY60NM60 RDSon 0.065 Ohm, Id 60 Amps, Qg = 178 nC.
Fairchild FCH35N60 RDSon 0.079 Ohm, Id 35 Amps, Qg = 139 nC.
ST STW20NM60FD RDSon 0.26 Ohm, Id 20 Amps, Qg = 37 nC.