gabe, ive always LOVED swiftech products and i would have no problem paying an extra 30 bucks for a copper top. you have another copper customer here.
got a question here though, why not just make the copper top for the GTX and nickel plate the outside and somehow make the same color as the stealth? It would still be matching and you have a copper top for the GTX.
you can make the stealth gpu cooling part all copper (colored to fit the stealth color scheme) and the ram cooling part aluminum. That way there is no metal mixing and everyone happy.
as for pice, i would lay down an extra 20-30 bucks in a heartbeat and im sure most people here would.
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