Suggest some mizuno irons?
Go with the MP-62 irons. I hit the MP-57, the MP-62 and the MP-68 irons and i got noticeably more distance out of the MP-62 irons. I love mizuno irons and have had my MP-30s for 4 or 5 years now and still love hitting them. They are a great club. The MP-62 irons are not a full blade so they offer forgiveness and are very accurate. Probably one of the best clubs you can buy right now.
Most of the irons you mentioned are better player's irons. The MP-52 and MP-58 are the most forgiving out of the ones you mentioned. The MP-57 is a cavity back iron designed for the 0-12 handicapper. The MP-60 has a blade look at address, but isn't a muscle-back iron. They're in the same category as the MP-57 as far as the sort of player than should play those irons. I'd look at the MX-200 or MX-300 if you're looking for more forgiveness. Either is forged like the other irons, but provide more forgiveness.
I will recommend the Mizuno MP 68 irons. Its overall head and face is very compact and coupled with the thick muscle provide the purest feel of any Mizuno grain flow forged blade. And it also provides golfers a more precise fit for improved accuracy and consistency.
Any one will work, you can buy a universal one from advance auto or autozone. As for power you will only gain 3 HP on your car. You will need to open your exhaust up to get like a 10 HP gain with the cold air intake