SPR isn’t needed for the type of wizard you wish to play full INT or a 3:1 INT:CON build is the norm Blood sucking is your only real sp sink and concentrated sp potion level 10’s will take care of that. Picking featherfoot is for utility and high single target dps vs warlock which is more aoe dps. Most players prefer Wizard 3 over Pyro c2 because of how elementalist charge times are so long and 50% more damage on rank 4-7 classes mean a lot more than the bonus from pyro’s damage at rank 2-3. Here’s an example of the average wiz3>ele3>feather1 build http://www.tosbase.com/tools/skill-simulator/build/86jrq89ob1/ freezing sphere isn’t amazing, while stone curse later is a godsend along with sleep to set up your skills with your party, you can also replace stone curse for rain + electrocute if you really want to, it’s decent aoe damage, just not amazing.
Here’s a good example of the class choices combined together. https://www.youtube.com/watch?v=e96K7U7TVok