Should I recap my speakers? If so who can do it?

I did my speakers with caps from Erse. VHQ metalized film. http://www.erseaudio.com/Products/PulseX
Very reasonable and I could not be happier. Excellent sound.
No need to change resistors. I would however, remove the FASTON connectors and solder directly to the board. Ditto if FASTONs are used on the drivers.

I beg to differ on the sand cast resistors which sound harsh compared to the inexpensive Mills MRA. Resistors do make a nice difference and improvement and for little money. Path Audio is best, but they are costly. Nice bang for the buck sound quality improvement with the Mills resistors. 

When it comes to crossovers, resistors should be wirewound, or paralleled film/foil types to get proper power rating. Stay away from metal oxide resistors at all cost!

My personal favorite are still the Mills MRA-12, but I also like Ohmite AG12.  

Rather than arguing about quality of parts. I think it is very important to see what kind of budget that James wants to use. I tend to be more frugal than others here and I’d hate to discourage him from an update. Even with some less expensive parts, he will hear a big improvement from the stock crossovers and really what it comes down to is what the person doing the mods wants to use. 

$4 for the MRA12 😊

Agree 100% will your post.  Many options from inexpensive to uber expensive.  It all depends on how critical the position is, the quality of the rest of the speaker and the owner’s budget and expectations.