Tungsten, in my opinion, is a lot better than lead. Although it is more expensive, it is smaller in size and is alot more sensitive. You will be able to feel your bait alot better with the tungsten weights. It also make the bait's profile smaller -- you don't want a big bulky weight in front of a worm for example.
I haven't had much luck with the P-line coated. I have only purchased it once and it must have been a bad batch. The line continually snapped at the knot, with a palomar tied, and at other places. I was dumbfounded...I checked my line for nicks and frays after every cast after that. I found none, but the line kept breaking. Like I said, it could have been a bad batch. Maybe some other guys can tell you if they like it or not, but as for me, I'll never buy it again. Try Yo-Zuri Hybrid. Much better product and cheaper too, I think.
In regards to the braid, it depends on what kind of application you're fishing. For a good all-around braid to use on a baitcaster, I use Stren Sonic Braid. Its some new stuff from Stren that lays on its side so it can bury in the spool on a hard hookset. For spinning reels, you can't go wrong with Berkley Fireline.
Hope this helps you find the products you are looking for.