The downpipe, fuel pump and remap will go a long way to getting you sorted. Brakes are a real necessity, if you can upgrade the calipers it would help. A good airfilter will help. I am running 360bhp on a 2.5" exhaust system, that may be a cheaper option for you. Your standard TMIC should be good for at least 350bhp. Not sure about the pinks as mine are bigger than yours as standard so I have not changed those. Cold air is good but not necessary imo. If you are not looking for massive power then that should do you.