The problem lies in the fact that you end up with a substantially weaker character by taking a prestige class. Prestige classes shouldn't be more powerful than a regular class, but neither should you be penalized greatly for taking one. As I said earlier, the ek makes a fine mage/fighter - a caster who can still hold his own in melee if forced into it, but he sucks as a melee guy who wants to throw a few spells. I know the optimizers want 4 attacks and 9th level spells at level 20, but I'm not interested in that (at least the spells part). I'd like to see 4 attacks and 5th to 7th level spells, depending on what else he can do. The bard minus everything that makes him - well, a bard - might be a good starting point. Medium bab, 6th level spells is great, but it would need aome other abilities to set him apart. Maybe a fighter feat every 3rd level? Every 4th? instead of the music/skills of a bard. He misses out on a 4th attack, but with the right mix of abilities it wouldn't be that important.