See invisibility is doubly useful, as you are capable of doing significant damage (at range, I hope).
The inquisitor's spell choice can be very difficult. They don't really need them in combat though. Personally, I prefer non-combat spells on them. With other casting support, I think they should take spells that the other characters will not want to always keep memorized but feel they have to. There are a couple spells that are uniquly good on them though.
Silence, because you and your front line do not need to be casting spells in combat to be effective, but those enemy casters will be very upset with you and your stealth will be much better.
Invisibility. You can always find uses and you will never have enough.
Lesser Restoration is always nice to have arround. Usually you either don't need it or need way more than you have memorized IME, nice for a spontaneous caster.
Resist Energy will be nice. When you need it, you want to be able to cast it on everyone, but its often not worth it for your other casters to memorize more than 1.
Align Weapon if you are fighting lots of stuff with /good DR could be very usefull, and the cleric rarely has this memorized.
I would not recommend Shield Other unless you are a ranged Inquisitor. Front line inquisitors do not have the AoE heal to be taking annother person's damage, unless your cleric doesn't mind focusing on healing you a lot.
Shield other is a poor choice.
1) If you are a ranged attacker, it is really easy to break the close range restriction, especially given that the rogue, ranger, and monk are all moving 30' or faster.
2) The downside of shield other is that it REALLY hurts when you get fireballed. Regular damage, plus half of someone else's. Are you ready for that?
3) I'll give a second vote to Invisibility, Silence, or Resist Energy, all good spells.
4) BUT, given that you're up against undead and yuan-ti, I'd expect a LOT of energy drain, ability drain, and poison (usually more ability drain). Lesser Restoration is really the spell of choice here.