Most lift kits are simply lift blocks and/or subframe spacers. There is only two companies that does a slight suspension spring lift, and I believe that is Mann Engineering and Primitive Racing that offers that.
I can't say which is best, but others include, but are not limited to: Anderson Design and Fabrication (as mentioned previously), Subtle Solutions, Gorilla Offroad, Scorpion Subaru lift kits in Australia, and SJR lifts (though they specialize in older and classic Subaru vehicles). There are many more I may have missed, but the market is there.
"Why would I want to profess my feelings for some 3D girl?" - Tomoya Aki from the anime Saekano