Good news!
Do you think it is possible to have multiboot so i can keep my android install and play around porting on a different image?
I will have some sparetime this month and if someone tells me where to start i am quite confident i could at least test some interesing things.

Please get a Moto z, it is much thinner and has blazing fast qualcomm 820 and better screen.
I am willing to support you with 100 bucks via paypal if you purchase whatever moto z series device you can get.
As you have seen the price drop to 249€ of moto z here in germany, i guess it will be possible to negotiate down to that pricelevel at many resellers also in your area soon.