If you're going Wizard and losing familiar, instead of those cruddy* Immediate Magics <snip>*Sorry, but they are.
The value of those Immediate Magics vis a vis the Familiar is very much a DM & campaign specific question. For example, the average lifespan of a Familiar or Animal Companion (though not Paladin Mounts) in many of the campaigns in which I've played over the past decade is about 2.5 adventures.
In a situation like that, the Immediate Magics are like gold- you at least have something you can use more than a couple of times over the lifespan of the PC.
If, OTOH, your DM is more critter-friendly, and familiars actually stand a chance of survival, then no, IMs aren't that useful.