Best 7850 for use with Accelero Twin Turbo II?

[terpstra]

I am putting together a new system and so far it's mostly inaudible and low power. I aim to keep it that way, but it still lacks a graphics card!

I've mostly settled on the HD 7850 which appears to have the best performance/watt in my price range (~210EUR). From reading other forums and reviews, it seems the best way to make a GPU quiet is to load an Arctic Accelero Twin Turbo II (TTII) on the card (~30EUR).

At this point, I know I want an TTII and a 7850.
The question: Which 7850?
The prices for them can be found on geizhals.de.

I've read that it needs to have a reference board layout. However, the TTII also has a 3-pin fan connector (to report speed?), so I assume I want a card which can use it? Are there any non-cooler and non-clock advantages between the models I should consider?

PS. I will be using this system under both Windows and Linux.