Hoses are hoses, assuming they fit correctly. The stock fans work fine. In fact, the stock cooling system on any 3S, if it's in good shape, works fine for basically everyone. There is very little reason to "upgrade" unless you have defective OE parts and can't source a replacement OE part or they're really expensive compared to aftermarket.Would you recommend going oem for the hoses and fans as well?
I have a mishimoto radiator waiting to install, but that's because my original is gummed up and isn't working that well any more.