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people who ask this kind of question want real answers, not just fanboy stuff you know?

Right now I have a powercolor r9 290x. I am selling it because it's both too hot and loud. I was sure that I should get a gtx 970 instead. But then I just saw that Amd is going to release the r9 300 series in February 2015. They will probably not make the same cooling mistake like on the 290(x)... And are using hbm and have other nice and good features. The problem is when I would first sell my Gpu in February 2015 it will probably go for almost nothing. So should I sell it now and get the gtx 970 or wait until then?
Any recommendations what I should do?
(I know I already posted this but my old thread ended in a discussion if the r9 290x really gets hot or not)

Yes, an overclocked R9 290X should beat an overclocked GTX 970.  But... it is not going to be by a large margin.
http://www.anandtech.com/show/8568/the-geforce-gtx-970-review-feat-evga/5
 
That is just one benchmark.  Go on Google and type in GTX 970 benchmarks, do your research thoroughly.  My guess though, is that the difference between the two is going to be very very small, 1-2fps in most games.  Also, it is no secret that some games just run better on Nvidia.  I know it is unfair, but it is the truth. 
 
In all honesty, it makes more sense to sell your R9 290X and buy a GTX 970, especially if it costs less than 220E.  Not only will you spend less money, but you will get better features(DSR), better drivers, and lower power consumption.  Even though your R9 290X will be running nice and cold with a G10, it will still be using almost two times as much power as a 970.
 
Doing the G10 mod is a lot of fun, and its really cool to say that you water cooled your card, but in your situation, it doesn't make sense.  Selling your R9 290X and buying a GTX 970 is going to be a better option in the end.

Much.

Yea, absolutely.  R9 290X is super powerful, it requires more energy, but yes, it is definitely equal to a GTX 970.
 
Another thing about the G10 modification, is that if you decide you want to later upgrade GPUs, you can use the G10!  Plenty of people on the OCN G10 Owner's Club have already transplanted their G10 + AIOs onto their new 970s, and 980s.

Ok thank you and yes I already have two intake fans in the front and also one in the top and one in the rear.
As you see it is a little complicated with my case, so I will probably just get the msi gtx 970.
So Thanks once again for all the help.

It is not really (only) for the performance. I would like to stat with the r9 290x, but then I would want to cool it better (and quieter).