When it comes to weathering I believe it is hundred per cent up to you what you like. Personally I like the weathered look and I think your´s is very nice. But in your case it all comes down to how hard the weather is to get off, how much effort you want to put into it, how happy you are with it today or how close you can get the new parts to the old.
Think about these four points and the choice should be easy
Here is a pic of my FX armor drenched in dirt and paint