This is one of those ill-fated Holy Bolt paladins that just happened to work. If it sounds like it sucks, just start playing with him in Sewers, Pindle, or Chaos Sanc.

Stats:
Str: 105, rest from gear
Dex: Enough for Block, 125 should be enough
Vit: Rest

As you all should know, Holy Bolt is the cheapest spell around for having a shifting cost. At slvl 38, it's a measly 4.3 mana per cast. No mana needed here.

Equipment:
Helm: Harlequin Crest or other +2 skills helm
Armor: Enigma or CoH, Vipermagi if you're cheap
Weapon: HotO, or +4 HB Redeemer
Shield: HoZ w/ Pdia or Um, so subs
Gloves: Magefist or Trang
Boots: Very flexible, I use Nat's
Belt: Arachnid
Rings: SOJ x 2 or BulKathos. +skills are paramount.
Ammy: +3 combat skills or Seraph Hymn

Keep in mind that this is still a healer at heart. If you want more undead slaying, replace the defensive auras with points in Sanctuary.

Skills:
Max Holy Bolt
Max Blessed Hammer
Max Fist of Heavens
1 point Meditation
10-20 Prayer
1-20 Vigor (explain in a sec)

So, since this is a party based character in many respects, the thing that really sucks is trying to quest him. This is where the Vigor comes in. Maxing Vigor for Hammer synergy is a good idea in general because it allows you to solo many areas where you need to kill non-undead enemies, including all of the act bosses. At slvl 38 w/ 13 points in Vigor, my hammer does 1235-1246 damage. At the same time, I have a prayer merc (yup, I'm a dork) with Doom staving off guys while I hammer, then switch to heal him for 187-385 per Bolt. Each Holy Bolt does roughly 9k-10k damage to undead, ignoring resists/immunities.

Numbers to shoot for:

1.2k life
400+ mana (allows you to switch off of Meditation when you want)
Max block
+18 or more combat skills

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Let's all play the way Blizzard intended: Without cheats, twinking, turbo, and leeching.

Maybe you'd all stop complaining.