Should I keep my MSI Big Bang Fuzion? Hydra GTX 460

Hello. My Asus P7P55D EVO is doing it's RMA now.

Should I keep my MSI Big Bang Fuzion now?

I would like to have
1) GTX 460
2) GT 430 for PhysX

And them, combine them with Hydra

I can also use the GT 430 for Adobe Premiere CS5 (CUDA, Mercury Playback Engine), and stuff like that

has anybody done a review on Hydra with those 2 cards?

Another idea would be
1) GTX 460
2) GTX 560 (when that card comes out in the future)

That way I won't be worried about selling my GTX 460 and I can be more relaxed with graphic cards, since I could use them for a long time with Hydra

What are your thoughts?

I have 2 options

1) Return MSI Big Bang Fuzion to the store and keep ASUS P6P77D EVO
2) Keep MSI Big Bang Fuzion and sell ASUS P6P77D EVO
3) Return MSI Big Bang Fuzion, sell ASUS P6P77D EVO and upgrade to a new technology (Maybe Intel Core i7 950)

I have Intel Core i7 875k overclocked to 4.2Ghz with Corsair H70 water cooling

I spent A LOT of time building my system so I sort of want to keep it, and I like the idea of using my GTX 460 for at least 1-2 years (with Hydra, if it makes sense)

I can use this GTX 460 as a primary card, and then as a secondary card (when time passes by)