I've had good luck with Whiteside, CMT, and Infinity. The later has been getting my money lately as they seem to have a slight price advantage, especially if you get on their email deal list.
MLCS bits have been dull out of the box and broken on me. For discount 'low use' bits, I now go to Woodline. They don't last as long as the brands listed above, but they still cut well for quite a while.
The jury is still out on Freud for me. The adjustable slot cutter is working well, but not enough cuts to know how long. The 1/4" spiral upcut I got from them broke after about 10" of a 1/8" deep cut into some plywood.
Jay