At what point does a person, especially a player, step back and say just because someone put it in a book doesn't mean it was a good idea? It's not like the authors have some robust scientific method for determining what things should be allowed. Making characters more powerful doesn't necessarily make the game better or more enjoyable.Nobody has mentioned so far the ridiculous overpowering that you can get from a relatively cheap consumable wondrous item:
Trivial to get several of these from his expected wealth of 200,000gp (and he ought to get the feats to allow himself to make them.
When you need to bring down the pain, prepare a whole set of maximised flame strikes, call lightning storm, fire seeds etc. Especially if you are likely to be active outdoors - arrange for stormy weather in one of several ways and cast one call lightning storm and you summon a 50 damage bolt every round for 15 rounds! Set off 8 holly fire seeds with a command word and do 184 damage (Ref save for half). Poison spell being maximised is a killer against living creatures. Each flame strike does 90 damage.
A standard strand of prayer beads is also great - +4 caster level on all spells for 10 mins per day? yes please!
The druid has access to really kick-ass damage spells, and access to typically overpowered divine magic items that allow him to REALLY take advantage of them.
Cheers
Eh, I know I'm barking up the wrong tree here (pun intended).