I want to be careful of what to use my beads on.

Ultimate weapons;

Shell Battlehammer - Fairy Beads
The Annihilator - Devil Beads
B.N.H. Knife - Fiend Beads
Age Rod - Devil Beads
Devil's Blue Sky -Devil Beads
Demon Lord Gloves -Devil Beads
Gaptahl Fangs - Dragon Beads
Spirit Lance - Fairy Beads
Conflagration Pipe - Fiend Beads

Clothes;

God Slayer Armor - Devil Beads

Gothic Rocker Robe - Fairy Beads

Gothic Maid Dress - Devil Beads
Elf Princess Tunic - Devil Beads

Items with Angel Beads aren't listed as you can get those beads from spawning enemies in +NG bonus dungeons.

Thanks for the help dude.

There are other weapons.

Fairy Hammer -> Fairy Beads
Corrupt Axe -> Fiend Beads (it gives Projectile Defense but it's cursed)
Carbonel Hammer -> Devil Beads (you need a Carbonel Hammer to make The Annihilator and another one to make the Shell Battlehammer, Asmodeus and Para's ultimate weapons)
Hammer of Gods -> Dragon Beads (you need a Hammer of Gods to make a Legendary Hammer, Will's ultimate weapon)
Haishel Sword -> Devil Beads
Karmic Scythe -> Dragon Beads (you need a Karmic Scythe to make Burial Scythe, Rag's ultimate weapon)
Hope I didn't forget anything else.

I think some of those weapons are found as treasure but I'm not totally sure. I don't think you can find 2 Carbonel Hammers in the same NG+ anyway so you probably need to make another one for the other ultimate weapon they are needed for.

Anyway Fairy and Devil beads are the only ones you should be careful, the others can be maxed in 2 playthroughs if you use Ful's Mil/Tears.

IMHO you should get the clothes asap, and later the ultimate weapons since all of them require the character to be a M level to use it (and for some characters it's a looong way). Also some of them need some ingredients you probably don't want to lose in your 2nd play (Spirit Lance requires to consume a Marwen Necklace and Age Rod a Marwen Ring and you don't want to lose them if you still have to level your chars).