Tint, what to go for?

When I bought my car the back window was all blury and you could not see out the back (at least clearly), turns out there used to be a tint on it and whoever took it off fudged it up pretty bad. Anywaym after paying 500 through Honda to get a replacement (not to mention 100 for installation), I now want to tint all my windows. Anyone recommend a percentage tint, or what I should go for. I want it pretty dark.