Need advice on getting a new PC Tower.

First, let me thank you all for your help in advance. 

I am getting a new super-large design tablet/monitor where I can draw on the screen. Since I am well connected to the games industry... I thought it makes more sense to go ahead and buy a PC Tower.  Now, I am limited on the money I can put towards this and I need to order it this weekend.  I know building it myself or having someone do it for me probably would be more cost-effective (but I would most likely botch that up and I need it to create some videos).

Currently, I have a Wacom Cintiq Companion 2, Wacom Mobile Studio Pro 1 and a BenQ PD3220U monitor.  I will be using the new computer for graphics, animation, video editing, maybe some 3D, streaming and gaming.  The new tablet will be 22 to 32 inches in size. 

I am looking at this build... but I am not 100% sure if that is the best.  Plus, I do not know this company.  I am in Germany... so there are a few other options.  But this is what I was considering.  I do not want to go over this price.

So I am curious what you all think of this build and this company.

Thanks in advance.