Just dropping by to really thank everyone who posted here for their advice. I will try to relate to some points later on, as I believe a thread like this can be useful for others who plan to get a new set. I myself read a few other threads before and it helped a lot.
I'll just say that I decided to stay with the PSU I specified but choose a different SSD with 250GB, so I will not have to worry about disk space (that would be first time since my first PC I think, which was Pentium 100 back in 1997, so I really wanted to avoid this inconvenience).
I even managed to download the game and play some 10 minutes, go near planet's surface. Yes, it is a totally different game!

Can't wait to get to a RES and engage in some duels, but currently I am sitting 2K LYs from Sol, had a plan to sell my exploration data via the CG but don't think it's going to happen (it ends today at midnight) as I still have some work to do.