For 800€ Bucks you get a nice system.
Aim for an upgradable pc and upgrade later, piece by piece, if needed.
I would never use any AMD or ATI products ever again.
I stick with intel i-2500k 16gbram(most important part!) and an old 560 ti, running well.
When you dev on high end spec and you fill your project till performance drops, noone will be able to play it under your specs, even if baked is running better then PIE.
Kind regards