We have found that 2 flute end mills are more cost effective than single flutes. For roughly 2/3 the price you get an endmill that will do great and last at least as long. The key is keeping your cuts clean and lubricated.
We really like these:
https://www.mcmaster.com/#8926a251/=15xkhf9
0.1875, 2 flute and $17.56
However most of our machining is done with 0.250 end mills:
https://www.mcmaster.com/#8926a321/=15xkiim
0.250, 2 flute and $21.46
For really tight radiuses we use these:
https://www.mcmaster.com/#8926a181/=15xkkh1
0.125, 2 flute and $14.17