Since I have upgraded and worked to perfect my F7 to just about the best that it can be....these are what you absolutely need: TBO's trigger, and a board with a microswitch as the optical board has a lot of bounce issues no matter how you set up your trigger. I recommend the Virtue Board if you can find it for a good price (Got my on Ebay new with Virtue eyes for $80 shipped---I think the board runs about $150 alone).
You do not need to upgrade the reg (super consistant and effecient when lubed/clean), or to upgrade the bolt. The stock bolt is pretty darn good. Look at the links in my sig on how to make lexan grips. I also have a thread somewhere on how to cut the stock bolt (reduces weight a little, and looks better).
I did like the Eigenram, but it will eventually break your popper valve. Lurker is working on a redesigned one, so wait for that first.