Or is it better to just stop putting resources into my current gear and saving it all for later on in case I find a new weapon? Most of my characters have level 4 weapons (before I realized what components were for I sold them all thinking they were just junk, I probably could've put a lot more into my gear).

). The best weapons (IMO) are only found in the final chapter, though they can be purchased before that. Also i found this useful in upgrading equipment effciently, as it gets quite expensive: http://www.gamefaqs.com/boards/928790-final-fantasy-xiii/53941597
That should be possible once i nail strategy down, though. Unless that too has some surprises when it starts to lose.