@jlhertel Other than that one special store, I will always look at these shops, that I all ordered from a few times before:
* ok1.de and ok2.de
Alternate in particular has a nice "configure your own machine" thing.
The Alternate Configurator is pretty good indeed, especially regarding compatibility of Mainboard/CPU and power requirement for the PSU. Their service is mostly okay.
In case some price comparison website favours Mindfactory: I've had a support nightmare with them, with many very unprofessional (sometimes directly insulting) mails received over several months and them refusing to replace components on warranty. It's a few years ago now but I'm avoiding them ever since.