For starters, 32 GB of ram will be a costly investment because you'll never get a chance to use it all up, UNLESS you ran a bunch of VM's or heavily use RAMDISK or even throwing a bunch of RAM into java apps you possibly run (Minecraft 16 gb's, why not?). 5 years ago, after spending $460+ I discovered I would at any time use a maximum of 10-11 gb's, even when I was running a 2 VM's to hog up 4 gb's of ram each, while multi-tasking everything else. Now-days 16gb will be way more realistic, and can put that money towards buying another GPU, which will have greater performance gains in terms of First build experience. If you insist on 32 gb's in the future, if you ever require, expansion is always an option using 2x8 sticks, but as also noted above, buying a set of 4x8gb sticks together guarantees they'll work together nicely.
PSU: buy a beefier PSU (850 -900 watts) for any future "GPU expansions", best PSU's out there would be Seasonic and buying a good PSU will also lead to a more stable system overtime as every PSU degrades eventually, but by how much depends on quality parts etc. I've personally been using Corsair PSU's (plantinum 1000 watt still kicking after 5 years in another older system), but most people would still recommend Seasonic for PSU.
