Move along, nothing to read

So I'm hunting for a new graphics card, and my set of requirements make this a difficult quest. I welcome all suggestions, either as comments, or as email.

I haven't seen any passive cards in the new R7/R9 lines from ATI, not sure if those will come out later only

Requirements

• MUST be supported by the open-source Radeon or Noveau drivers.
• MUST support at least 3 digital displays (DVI/HDMI/DP etc, not VGA)
• SHOULD be cost less than $300
• SHOULD occupy only one PCI-e slot (trying to avoid double-height cards)
• SHOULD be passively cooled, or after-market water-cooled
• NICE TO HAVE: good 3D performance

Options so far (for further review)

Notes

I have tried the following cards already without success:

• Galaxy MDT X4 GeForce210
  This card implements 4 DVI in a design like a pair of inline Matrox DualHead2Go units, it mucked badly with the EDID and crashed Noveau.
• Matrox ??? older 3 or 4-head card: only first output supported on open-source driver
• Gigabyte Radeon HD 7970 OC Edition: radeon driver very buggy when DP used and other outputs

For reference, my monitors are 2x Dell U2410, 1x Dell U2413. So I have DVI/HDMI/DP on all displays, and the U2413 has DP1.2 MST as well.