The 9700 is probably the most overhyped, overpriced, underperforming POS on the market. I hate it on the same level as the Antec 900. You can get the Xigmatek HDT-S1284
which will outperform the 9700 for less.
I'd just stick with the OCZ kit
which is cheaper and you should get decent speeds and timings from it, just as good as the Dominators. Corsair only charge extra for the fancy fins, they still have the PROmos crap the latest batch of XMS2's have.
If you can save a bit of money in those few areas, you could put it towards the HD 4870's. Like I said, not only do they perform better, but you also won't be stuck with a god awful Nvidia 750A.