I've converted everything over to Milwaukee.  I think the brushless Fuel tools are very good with much more power and cooler operation than my previous non-Fuel tools.

Don't overlook the little 12v tools... the Fuel versions can handle more than you might think.  I have a 12v Fuel driver and hammer drill and they're what I use most (aside from heavy rough-in work where I pull out the 18v stuff).