Full sets of custom gear can take alot of components to keep up to level. I'd reccomend keeping just a few custom pieces and use item drops for the rest. Usually a cool chest and leg piece, and custom weapon. Then you can color match any new gear to the chest piece.
This, unless you have alts. Getting all the mods for armour is 11 comms. If you run the all orange setup that's 55 comms per upgrade, plus your offhand and main if you use orange pieces there.