Last time I replaced my UPS, I pulled the batteries out to dispose of properly. I found that Batteries + will do that, and when I took the batteries in, I saw on the shelves the exact battery I was bringin in, which means I could have just bought those instead of buying a whole new UPS. If you...
In my opinion, you want the PSU to run no more than at about 80% max load. A 600W at 80% is 480, so that would be my personal minimum recomendation, you can go higher, but don't get a higher watt PSU at the expense of quality.
I'm not at home to run the test right now, but, wired my PC gets about 4.7-4.8 Gbps on my 5Gbps internet from my ISP. Never used this rig with wifi, so can't give a comaprison on that.
Microcenter would be a place to look for cases in addition to Amazon or Newegg. I know that Bestbuy also has some computer componnents, but I don't know what they might have in the way of cases.
I don't know if it would be considered a fortune, but, I picked up a 64GB kit of DDR5 6000 from Amazon for my newst build. It was right over 300 with tax, but I probably won't build again for 4-6 years so wanted to make sure I didn't have any issues until then. Also, I've been using 32GB on my...
I don't know what your budget for one would be, but, if you have a microcenter nearby, they have them listed at $299 currently, if you can't find one used at a good price