If your primiary objective is weight reduction, I'd steer clear of the older prodrives like P1 and P7. They're both very heavy. P1 weighing in at 19.5 lbs, and the P7 weighing in at a hefty 22 lbs. They're also the only wheels that have the exact offset and width though. So if fit, quality and not needing to roll your fenders are priorities for you, then get Prodrives. I have no idea about the weights of the newer Prodrive wheels. I would definitely recommend NOT going below +50 offset, certainly with a 7.5 inch wheel.
I went with the SSR type C, but ran into fitment issues, had to roll the fenders, and regret it. I have 1 set of WRX stockers for winters, and my original stockers that I'm going to mount autoX tires on.