If you are building a CNC mill or a robot you might want to look into International Rectifier's IPS3313 intelligent switch. It will handle 45 amps and 32 volts and has built in thermal and current limiting in a 5 pin TO-220 package.
I've been using them as an injector driver with a Megasquirt EFI clone on my !950 Jeepster F-head ( don't ask! ) without a hitch where IGBTs have had a nasty tendency to let the 'blue smoke' out.
The best news is that they are $5.05 US in singles or $3.79 for 50 on the IRF samples website.