Well, you specified hit points as a requirement so that rules out True20.
My second choice is my house ruled 3e which includes
1. Sean K Reynolds Fewer Absolutes
2. Variants from the 3.0 DMG, and Unearthed Arcana, the Cityscape Wilderness/Urban skill swap, and the spellless Ranger and Paladin variants from Complete Champion (well, something similar since I have been doing this since seeing a variant elsewhere in early 3.0), and a slightly tweaked OA Shaman that replaces the monk
3. Ignores most other WOTC sources of player material and alternate mechanics except for a handful of spells, feats, and magic items.
4. Incorporates third party material including, but not limited to the following: Green Ronin's Cavalier's Handbook, Psychc's Handbook, Shaman's Handbook, and Witch's Handbook; Malhavoc's Book of Iron Might (for the maneuver system and some fighter abilities), Blue Devil's Poisoncraft, Mystic Eye Game's Artificer's Handbook (well, now, the revised slot creation that Curtis posted on ENWorld).
5. My own house rules including: dropping level drain and XP costs, boosting some the classes in skill points, changing the multiclassing rules, dropping some spells (e.g. Rope Trick, Law/Chaos Spells, Prismatic Spells, Tenser's Transformation) and revising others (e.g True Strike and the Animal Buffs).