If it's quiet you're after go with the resonated, this said, we did have one customer who bought the resonated and weeks later came back for the non resonated pipes...
Interesting.. I might be able to knock some money off. How much are they new from a good fellow such as yourself?
OEM fans are dear, circa £250 each if I recall, we do also offer an aftermarket option from Mishimoto, which is priced at £180.00...