Many of us are still experiencing bugs in the creation kit even after several patches. The developers had managed to create the entire game with the same tool. My question is what makes the developers systems different that they don't experience bugs?

Since I need to upgrade my pc anyways, I might as well get something with the exact same system specs as the developers who made Skryim in order to have as little bugs possible.

The developers had access to the actual game engine and also most likely had all their machines on the same network. In addition, they made use of a Version Control System which is actually the source of a lot of bugs in the "retail" CK - they removed the VCS and that causes issues with certain aspects of the CK. The developers are aware of this and are working on bug fixes for the biggest issues revealed by the lack of VC.

3rd party software plugins, version control, software engineers who understand the engine (since they wrote it) and a QA department is probably the difference, i would reckon.