What are your suggested upgrade paths?
I usually center mine around how the game is going. For instance, if I am there at the beginning of the map and seem to get through the first 4 levels fast I will do W1, Shotgun, HMG, then get A2, HA, then A3, then go back to W2 and W3. If I join the game late, I usually get W1 then a Shotgun, then get up to A2 or 3, then get either HMG or W2 then W3.
How about with the 50 level mod? I haven't experienced it much yet, and most games don't last long enough to actually use most of the mod.
What are your upgrade paths in co_ maps?