I had a ek4 b16a conversion with bolt-ons for about 4k. Should of bought that...

But yeh, on a serious note, for bang for buck, ill get a b16a conversion and add a b20 vtec bottom end. Works out to be around the 6-7k once its all done with a fresh bottom end, plus its makes more torque than the B16b

Goodluck with your choice