Choosing a graphics card

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Hello,

I seek an advice in choosing a card.

Recently a new gtx 1080ti strix has appeared in my area.
I'm very close to order it.

But, looking back to 1080, the "older" they got, the more OC'ed and advanced versions of 1080 got out.
E.g asus has these of 1080:
1. A reference
2. ROG STRIX-GTX1080-8G-GAMING with GPU Boost Clock : 1733 MHz , GPU Base Clock : 1607 MHz
3. ROG STRIX-GTX1080-A8G-GAMING with GPU Boost Clock : 1809 MHz , GPU Base Clock : 1670 MHz
4. ROG STRIX-GTX1080-O8G-GAMING with GPU Boost Clock : 1898 MHz , GPU Base Clock : 1759 MHz
Each next is faster than the last one.

Should I wait for some time, or should I buy the one (1080ti), that is available for me right now?
Cuz I think all the card are the same, but each of them is tweaked a bit more to be sold as a new model.
At the moment there is a sweet Zotac amp extreme 1080, but it has appeared just before the 1080ti, basically after a loooong period since the 1080 exists.

There surely will be better versions of 1080ti, but I don't think, i can wait that long.
Any 1080ti costs quite a lot, so I think nobody want to make a bad choice.

What do you think about reference models? Other card manufacturers?
2 fans against 3 - more quiete? Hybrid cooling?
Any othet advices in choosing a GPU?

Thanks in advance!