I agree with buy as you need them. I only use my tailed router for shaping the edge of tables, etc. So the ones I personally use most are roundover and ogee. If you are going to use it for dados and other joinery, you need other types/shapes (that I can't speak to). As for brands, my new "thing" is the Freud Quadricuts - beautiful edges even on maple. Whiteside has an excellent rep but I haven't tried them. I also have some Infinity.
Fred
"All that is necessary for the triumph of evil is that good men do nothing."
“If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals.”