Just wanted to share a picture of my build.
Zero experience in building and now I have this beauty. If any of you is doubting whether to build or not I would argue strongly for you to build your own box if you are serious about DL.
Skin in the game
Investing a substantial amount of money in your new build proves to yourself that you are serious about this DL stuff.
Finishing the build, with the hassle it entails to choose the parts, source them and get everything to work smoothly (both hardware and software) is HIGHLY satisfactory.
The fact that you worked this out for yourself from the ground up means you know each step you took and can easily change if necessary (e.g. change a computer part for a new one or modify your dev setup).
Ease of work
If you can afford good hardware, everything is easier than relying on external compute. Running a notebook is smooth and fast, no lags. This facilitates experimentation enormously.