Disk Brake Conversion - to upgrade ball joints and tie rod ends or not

[jocko]

Quick question - I'm looking at 2 CPP kits, both are identical with the exception that, for $100 more, one kit's spindles work with 73-87 ball joints and tie rod ends (and the kit includes them). So, I'm wondering what's so special about 73-87 bj's & tre's? I understand they are more plentiful, however, I'm not sure I see myself replacing ball joints and tie rod ends every year or so... if ever once I replace them once. So, PERFORMANCE (of the ball joint or tie rod end)-wise, is there something better about the 73-87 stuff that would steer me toward that choice (no pun intended, it just kinda rolled off the tongue...) I also realize that if I were to buy the kit without the upgraded stuff that it'd cost me > than the price tag diff ($100) to buy 66 ball joints and tie rod ends - so money really isn't the question here - wondering why the general consensus I've seemed to pick up on the site is to upgrade to 73-87 stuff when doing this (and that is the direction I'm leaning).

I think the 4 wheel DB conversion is a bit too expensive for me and probably overkill (although it WOULD be cool....). Also think I may just go with a master cylinder and booster form NAPA or something like that vice the CPP one - and just use the CPP spindle/disk brake kit (either with our without the tie rod/ball joint upgrade, TBD). Any drawbacks you can think of with the NAPA approach to save a few bucks?

Thoughts??
Thanks guys.