Cool/Quiet AM3 Heatsink?

I have a Phenom II 955 X4 OC'ed to 3.6 Ghz with stock cooler in Antec P193 case. It idles at 36-38 C, gets up to 45-50-ish at full load.

I'm in the market for an new Heatsink for my processor so I can push the OC higher and keep temperatures (and noise) down. My reqs:
Height can't be over 140 mm (P193 req.)
Width: Could sacrifice 1 RAM slot adjacent to the CPU if necessary (M4A79T Deluxe Mobo)
Weight: Not too heavy to risk damage on a vertical (tower) mobo
Air Flow: Whatever gets the job done
Noise Level: Quiet! 15-25 dBa i guess.

Any ideas for a good socket AM3 cooler to meet those requirements? There's a lot out there and I'm not sure where to begin.
I've though about these two, but they might block more than a few RAM slots (not sure). I'd like to buy it from Newegg or Tiger Direct. I don't have any brand preference, just want a good cooler.

Arctic Cooling Freezer 64 Pro
]http://www.newegg.com/Product/Product.aspx?Item=N82E16835185125]
Arctic Cooling Freezer 7 Pro
]http://www.newegg.com/Product/Product.aspx?Item=N82E16835186134]

Doesn't have to be huge or super-powerful or anything, just something for a moderate OC (4 GHz) at safe temps. Case has pretty cooling already, and I'm adding some intake fans at the front too (120 mm).

Suggestions welcome. Thanks a lot guys!