The problem I have with Grenadier is that it trades out brew potion, and iirc I can't just pick it back up with a feat since I don't have a caster level. Then again I could just take infusion, so maybe not such a loss, especially since we don't often take the time to craft.
I sorta convinced myself mid post, so yeah Grenadier sounds pretty good.
Edit: As for what I want to do, I guess being useful in and out of combat. I've got some good combat things down, plus I have 10 skill points a level so that should be useful.
I took most of the knowledge skills along with perception, and craft alchemy.
I was considering going into the Brewkeeper prestige class, but can't do that if I am trading out brew potion.
So I guess most of the advice I'm looking for is feats discoveries and extracts at this point. I am going to probably take the Hellfire bomb since I like playing up the Tiefling aspect of the character