Just some general advice from me when undertaking an FI build to anyone.
It's very easy to start going through catalogues of stuff and spend as much as your credit card allows buying stuff... but unless the car is to be a show car of some sort, I tend to think a lot of it can be a waste.
Personally I'd always tend to keep things as simple as possible, and find the potential / limit of where I can go with what I have, and then when there's a reason to upgrade something, do so! - This is not about doing things on the cheap, because I know from experience with cars, doing things cheap never ends well... but it's about knowing what you're upgrading and why it will make a difference over OEM / or over the part you're replacing with.... and most importantly, how will you measure that change?
Just some food for thought!