I would say to go with a 3 inch single exhaust - Post PLM header I am changing out to a 3 inch flex pipe - 3 inch spun cell cat - k teller tubing kit with a vibrant resonator, muffler and resonated tip - I'm trying to high temp coat the inside of the pipe as well. Also after living with no ps or ac for a month I would switch to an electric ps unit and roll the windows down, I am thinking about a vintage AC since my heater core is no beuno. Also the carbon fiber plugs for the sunroof seem like they might be available in the next month.
I would have added cams to the RBC gear, looks like you've already done the k20 oil pump but I would consider the Fluid dampener crank pulley.
This is actually the plan now that my Ktuner is on it's way.