the exhaust's that you mentioned are good, I would personally go with either the greddy or rsr units, since the ws wouldn't give any gains.
Vafc would be good

but until tuned it wont do much so youre looking around 250 for the part and another $100 roughly to tune it.
If you want to stay below that I would go with an AEM pulley set
I think some members are selling them for a decent price in the parts for sale section.
For your header I would get either the Greddy 4-2-1 or leptolude is building a 4-1... check NA forum for more info.