you dont have to do anything to the wheel well..you will have to cut the firewall...a friend of mine also did something to the inside of the car instead of cutting the fire wall but i cant recall what he did, ill ask him and post it up ASAP.

parts dont really cost more for H series, they're as abundant as B series engines except they usually go into Accords when swapping them.

its really up to you and how much cash you have. If you want something easy to put in without any MAJOR modifications to the car, go with the B series. If i had the cash *again* i would probably put the H22A in a 4 door. A tad bit more torque for a slightly heavier car. Its really up to u dood, good luck to ya