Make sure its electronic safe, preferably no clean flux

Or it may end up a corroded mess...

Who cares which plugs you use, both are decent, just pick one and make all your stuff that... Simple.

I don't understand not being able to solder deans, they give you a whole tab to solder on to and the solder flows very easily on it... Tin the wire, put a drop off solder on the tab, put tinned wire on tab, touch with soldering iron, remove soldering iron, hold in place until it hardens. Tada. Simple.