White Whale said:I think the E6 idea is interesting, but like some other posters I feel the advancement beyond level 6 may be a bit dull.
How familiar are you with the eight-book Complete series, the Races series, the Spell and Magic Item Compendiums, Player's Handbook II, Heroes of Horror/Battle, the Dragon Compendium, and Dragon Magazine?
I find that many of the feats and spells in these sources offer a tremendous amount of variability, far more than higher-level class abilities. While Core-only E6 could get dull, I think, E6+additional WotC material could keep the game going for a very long time.
For instance, let's take Complete Scoundrel's Luck feats. Ordinarily, they're pretty neat, but not really possible to get more than 1-3 of unless you're giving up some very key feats. With E6, you can take almost the entire chain, and be the Luckiest Hero Ever. And then, if you want more to do, you can learn the Spring Attack chain, or pick some some tactical feats, etc, etc. That seems way more fun than a few additional BAB and some minor always-increasing abilities, AND it doesn't become impossible to DM well, like D&D's higher levels.