Meh, I wouldn't trust RAM reviews at newegg too much honestly. 328 is possible but it takes quite a bit of know how and beyond that 2.8v is way too little even for Samsung TCCD's on BrainpowerPCB
OCZ is selling DDR635 RAM now I believe lol, that's 317 right out of the box and that's at 3-4-4-10 timings with a decent amount of voltage because it's meant specifically for the DFI Nf4 board.
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G.Skill LAs (most expensive)
OCZPlatinum Rev 2s (second I believe)
Patriot XBLs (least I believe)
They are all samsung TCCD on BrainpowerPCB so chances are they will all hit atleast 275MHz....I know the patriots are guaranteed from the manufacturer to hit 266MHz, at 3-4-4-8 timings, but I know they can hit tighter, the manufacturer simply uses those really loose timings to 100% ensure it'll run.