Wippit Guud said:So, a suitable PrC for casters woudl have no +1 spellcaster level, but maybe +1 DC on existing spell levels?
So a sorcerer with 10 levels would only be able to cast lower-level spells, but at +10 DC check.
Not quite. Spell save DCs don't automaticly go up when you gain new levels, but caster checks for purposes of dispelling and SR do. If I ever intend to affect enemies with my spells, I can't afford to have the caster check any lower than the maximum it could be for my character level. SR is hard enough to get through at high levels without loss of effective caster level.
I do think PrC can have abilities that make up for high level spells though. Most spells I use most often are 3rd, 4th or 5th level. No wish for me? That's fine, so long as I can still control their minds/blow them up/whatever my theme is. 7th/8th/9th level spells get complicated a lot of times anyway. Just look at timestop, wish, and shapechange. Those spells should be an option for a spellcaster, not the only effective path.