Compression Ratio Question

[talonsway]

Hey guys, Im rebuilding my 1g 7-bolt motor that i spun a rod bearing in. My question is about a set of pistons i found. If i remember right a 1g 7bolt piston has a compression ratio of 7.8:1. I found a set of SRP forged pistons with a compression ratio of 9.0:1. This is my first time ever rebuilding a motor. And im more curious about the compression ratio and what it does. Right now im on a 20g going to be on e85 soon. So im wondering what compression ratio would fit me best. My goal is to eventually be around 400-500awhp and switch up turbos eventually. thanks for any input