Skunk2 manifold all the way... I know where you can get one for around $300 pm me if you need it.
As far as the throttlebody... if you wanna spend $600 then buy one(Type-R)... if you wanna spend $150 then get one bored out. Mine is bored out to 64mm with a skunk2 intake manifold and it runs great...
Notice: I have a B18 and 64mm is plenty. 70 is WAY overkill especially for a B16.