If you're not in a rush since you say you won't be going till next year, just wait it out a bit to see how the Thunderbolt 3 market shapes out. Things will hopefully get cheaper and there may be some sweet deals during Cyber Monday and Black Friday.
AKiTiO has an eGPU coming out, planned Q4 this year. Will be affordable!
But if you are in a rush, I would suggest taking @D2ultima's advice and go for a Clevo. I have a Razer Blade Stealth and it just has way too many issues that I simply just stick with my MacBook Pro now, playing games through a Windows EFI. When I can afford a new laptop, Clevo is at the top of my list or until the new MBPs with TB3 come out.
Even then, be a little patient. There's a lot of cool new tech coming out. Modular technology is the big thing coming up now, so I'm sure companies in the industry are building cool stuff that might be really affordable, and worth the money and the wait in the long run.