Originally Posted by
Lathais
Why do you think you need SLI? You really don't. The only possible reason for needing SLI is if you already have the best single card solution on the market and for some reason it is not giving you the performance you need. You said you are not interested in 4k, so you don't really need SLI. Grab a 1080 once the third party boards come out and see if the performance is enough for you before scrapping your current hardware IMO. Even 980ti's handle 1440p well, the 1080 will be even better.
Same thing for the PSU. Why do you want a new one? Is your current one failing? Newer Graphics cards are using less power, so whatever you have powering your 970 will be enough. Unless it's really old, like 4+ years or something, it should be fine.
Case is entirely personal preference. I myself am a big fan of the Corsair 200R, because it's budget friendly but still has all the features I want and is very sturdy. Other than that, I can recommend the higher-end Corsair cases, Fractal Designs R5 is great for a good "silent" case and Phanteks makes some good stuff.
SSD, Samsung 850 EVO is about the best you'll get. There are plenty that are faster in benchmarks, but we're talking about it saving you fractions of a second here, nothing to write home about.