Bigger is better on the boosted cars, but on the N/A motors balance will net more power, ZZP offers "ER Ratio Rockers" they are 1.85 on the intake and 1.8 on the exhaust and make more power then 1.9'* on both. Heres the link to ZZP
but others offer split ratio rockers if you look around the big vendors.
ZZP Has an article you can download about the research that went into the different ratios, and their benefits.
Have you looked at the ZZP HV3 Insert
yet? Its cheaper and offer the best bank for the buck for the N/A Guys!