After struggling to play any relevant games (think any new games from 2013+) on my old machine (HP Pavilion Elite e9270t from 2008) or anything that required DirectX 10 or better, I decided to finally spring for a new video card and PSU. Suffice it to say they wouldn't fit in my old computer case as the HP wasn't made for these components and I ended up trashing my old PC and building a new one from scratch.
I use my new PC for a balance of work (word processing) and casual gaming. I'm not a huge gamer hence trying to stay around the $2,000 budget and re-using some of my components from the HP. I'm currently running with an HP 2709m monitor that's only capable of 1920x1080 - making the EVGA GeForce GTX 980Ti overkill, however, I plan on eventually getting a 4k monitor to take advantage of the power I have.
Steam sales are the bane of my existence as I literally have 30 games I purchased over the last two years on sale that I couldn't really play until now. I have a lot of gaming to catch up on ;).