The first-aid kit is an item, not a spell. You can only use it once and then it's gone forever.

Giving up a summon seems like a bad idea, and remember that Foshizzle is a really deadly move. Just imagine casting Defender on someone who knows Foshizzle; once they lose some more HP they'll have an incredibly strong spell at their disposal.

Also, it's true that the person who casts Disbalance takes double damage after casting, as with any other spell, but that only lasts one turn. The effects of Disbalance affect the target until they're pwned or Dispelled, so it's definately worth having.

Animate Dead and Burial seem like they have really limited uses. I can see trading RTMA for Animate Dead, but Burial is really situation dependant. You can unblock a path and keep an enemy down for good, but Anti-Magic is just as good. Really it's tough to choose good spells for Uberbob, since it's impossible to know which ones will be useful. Animate Dead and Burial would be useless in a fight against enemies like the Birdclaws who mostly use summons, and Anti-Magic and RTMS would be useless against enemies who rely on physical strength instead of spells. The only sure thing I can say is to trade Fysics Phailure for Disbalance, because FP is unpredictable while Disbalance is ALWAYS useful.