This is my first build and I'm glad I did it. I built this mainly for light gaming (CS:GO, Ultra settings, 120fps-200fps avg) and web browsing/HD videos. All the parts include tax and shipping, but does not account for rebates. My lovely girlfriend bought the monitor for me as a birthday gift :)
A few things I slightly regret:
1) Not putting out $20-30 more for a better video card, although the R9 270 works perfect for what I need. It would just be better for the future in case I do play some more graphic-demanding games. I've seen the R9 280 go on sale for $150 a few times, and regret not waiting for it. But, not too big of a deal.
2) Not getting a larger SSD. I knew 128GB was little, but it did not hit me until I saw how fast I was running out of space. However, boot times so much quicker and everything just feels faster with it. I wish I shelled out another $50 and got a 250GB Samsung 850 Evo or a Crucial one. The Sandisk one I got was cheap, but outdated. Again, not that big of a deal.
3) The Corsair Spec-01 case. I personally think it looks cool, especially with the red & black design. A few problems with this case was that there is very little clearance at the top. It was super difficult trying to screw in the motherboard in place because there was almost no room! I even hit the motherboard a few times with my screwdriver because the screw would not sit in place. The lack of top clearance is probably due to the fact that there are no upper grommet holes above the motherboard for cable management.
Things I've learned:
1) Building a PC with a non-modular PSU can get pretty messy. I like all my cables to look neat--next time I'll probably invest in a modular PSU.
2) Look into a good case that allows enough room for cables. The case I purchased had some room, but it would have been a hell-of-a-lot easier/cleaner if there was more room.
3) Get a good monitor if it's in your budget. My girlfriend bought me the Acer monitor as a gift and it is excellent. I would recommend saving enough money towards a good monitor since it is what you'll be staring at 99% of the time.
4) Building a computer is a very time-consuming thing, especially if you're a beginner. Researching parts/waiting for deals can take days or weeks. But once you put it together and it works, it's one of the most rewarding things ever.
Edit: Rebates totaled to around $60, so the actual cost was ~ $573.