hi just did q quick search on ebay and found a few under £300 by far ?
JASMA Lightweight CRANK PULLEY 3-piece Kit for Honda Civic B16 B18 EG EK DC2 | eBay
WORKS ENGINEERING Light-Weight CRANK PULLEY 3pc Kit CIVIC EG EK DC2 B16 B18 | eBay
Google search: ATI Harmonic Dampers
ATI not needed on a stock internal setup, but I say yes to having it on high reving engines.
When you say high revving, how high are we talking?