Everyone who has had good experiences of their IR will recommend the school one went to.
I did the Multi/IR with Atlantic and am happy to recommend them. While I was there (fourth quarter 2002), the first time pass rate was... 100%. Yep, that includes me! (Amazing, init!)
Good setup and facilities, modern planes (Seminole

), excellent instructors. Whatever school you decide to go for, make sure to take the time to pay them a visit beforehand. You can learn a great deal about an FTO this way.
All the best and enjoy the IR!