collector weapons arent all that bad (my main STILL uses a collector focus)....and some of the greens arent that bad either. If your heroes are from eton then they have max stat weapons already--just upgrade them as you get better drops, nightfall ones will need the help---once again, keep drops that look good---lots of purples have good stats!! removed mods from bad drops--keep these to put on golds (or nice purples)....
I have never bought a hero a weapon, they get drops or collector stuff (some still have what they started with

....)...and after I have 'dedicated' some of the destroyer and oppressor weapons--they have gotten them.
so use what drops, gets some collector weapons and greens arent that bad for heroes.