I think your parts will make up a very solid base. Nice choices there, except for one. Yes, it’s the PSU. DO NOT SKIMP on paying for a PSU. I prefer Corsair or Bequiet! myself. Although I’ve also read good things about Antec and the other brands that Icaraeus mentioned.
You can easily update everything else as time goes by. Get an HDD now, and add an SSD later.
Make sure the mobo has enough slots to add more RAM later. 
(It’s a small thing, but don’t get 4x2GB RAM sticks, and then find out you only have 4 slots) .
Good luck.