i wouldnt bother with the 290s till they put out some none reference coolers for them, other wise that is a good system and you can push the 8350s much further then that on a h100i, i had mine at 4.6 on an evo 212.
i would hope they put some out before Christmas but like i said i dont know. I have a 280x matrix and that thing is great for gaming but it isnt the Hawaii chip.
You should be able to reach 4.3-4.5ghz with a cheap cooler like the Hyper 212 EVO. You can use the money you saved to up your ram to 16GB and never have to upgrade for a looong time.
AMD does not think it is necessary to have better coolers on their 290 and 290x saying that every component on the cards was made to run at 95c throughout the lifetime of the product. Even if better coolers didn't improve performance, wouldn't more people be likely to buy them if they had lower temps?
If AMD's reference cooler was quiet, I'd buy one. If they say that it was made to run at 95c, I'd be fine. I'm just kind of wary about the noise, so I went with a much cheaper HD 7950.
Yeah I've heard some sound tests, kind of ridiculous how loud they are... I wish they were quieter or the freaking non-reference cards would come out already