For all you poor people playing more or less untwinked trying to go to Hell in HC SP no-trade:
Blood Helm (Deadly Strike, LL) = Magic Helm/Casque/Armet + Ral + PRuby + Any Jewel
Hit Power Gloves (Knockback) = Chain Gloves/Heavy Bracers/Vambraces + Ort + PSapphire + Jewel
Blood Gloves (Crushing Blow/LL) = Heavy/Sharkskin Gloves + Nef + PRuby + Jewel
Blood Belt (Open Wounds/LL) = Magic Belt/Mesh Belt/Mithril Coil + Tal + PRuby + Any Jewel
Blood Boots (Replenish/LL) = Magic Light Plated Boots/Battle Boots/Mirrored + Eth + PRuby + Any Jewel
Caster Boots (Max Mana/Mana Regen) = Magic Boots/Demonhide Boots/Wyrmhide + Thul + PAmethyst + Any Jewel
Sigons = Gloves / Belt? / Boots
And Valkyrie at level 8 gets a Rare Lance that kind of makes a bit of a difference (hard to tell, honestly).
For PI's in early Hell a point or two in Guided Arrow can help, but maybe that's because I under-invested in Freezing Arrow. GA can also help with Hell Andariel.
Imbuing Coronets/Tiaras can help as well, or Circlets if you're really strapped in NM difficulty.
More at
http://classic.battle.net/diablo2exp/items/crafteditems.shtml