making a campaign V3.5, heavy homebrew

[nonsi]

If you haven’t really started reinventing everything yet, then you’d be better off making the correct tweaks than rewriting the game.
Take it from someone who knows. I probably wrote the most extensive D&D house rules codex ever and I’m telling you that achieving class balance by rewriting the game is incredibly difficult.

To save you a lot of time (and I do mean A LOT OF TIME!!!), I’d suggest the following changes to the core rules and they would do wonders for your game, regardless of the game supplements you’d use:

1. Use these rules for martial combat and actions.
2. Casting Defensively: make the DC equal [15 + 2*SL + 1/2 highest BAB among creatures threatening you +2 per creature threatening you beyond the first].
3. Don’t allow more than a single metamagic on a spell that’s being cast.
4. Don’t allow Divine Metamagic.
5. Don’t allow caster level enhancements to stack - ever.
6. Reduce Medium range to 50ft + 10ft/CL and Long range to 100ft+20ft/CR.
7. Change the casting time of all spells that force conditions on their victims to be 1 round.
8. Increase the casting time of Planar Ally/Binding and Gate to several hours.
9. Prismatic Wall/Sphere: Rule that the caster is not immune to the effects of his own wall/sphere and cannot pass through them.
10. Ban all forms of Celerity.
11. Apply the following rules to force effects:
- Force effects have Hardness [10 + Spell-Level + primary ability-mod] and [5 HP per Spell-Level].
- Force effects don’t get partially damaged – if they’re not breached, they endure as if nothing had happened.


If the above suggestions appeal to you, I'd also make suggestions regarding classes.