1) Actually, with a 7770 you'd probably max out performance at your current resolution.
For performance, you'd upgrade your CPU and GPU. Going from a i3-3220 from the G2120 for $20 more, you get hyperthreading which is pretty big when you're doing things in the background while playing games. With the extra $70, you would also upgrade the 7770 to the 7850 for $40 more (the XFX 7850 is on sale with the $20 MIR).
Some other options:
- Get a SSD 120-128GB $90-100, Recommended: Samsung 840 > Samsung 830 > OCZ Vertex 4 > Crucial M4 = Corsair Force GT = Kingston Hyper 3K
- Increase RAM to 8GB for $10 more
http://www.newegg.com/Product/Produc...82E16820233144
- Upgrade HDD to 1TB for $10-15 more
http://pcpartpicker.com/part/western...drive-wd10ezex
- Get a nicer case
- 1366x768 monitors are available for about $90, not much of an upgrade over 1024x768 though
2) You actually don't need an anti-static wristband. The recommended method of preventing static is to discharge yourself onto the computer case before you start. I would also add that you probably don't want to be walking around on carpet with shoes on, as most Americans do, because it creates a charge. I've built a couple of computers and disassembled my laptop several times and have not shocked anything. I feel like its a waste of money, but its up to you.
Since you'd be using the Intel stock heatsink, it already comes with some thermal compound applied. Aftermarket coolers come with their own thermal compound as well. While thermal compounds are relatively cheap $5-10, they're more for overclocking.
The only tool you need for assembling a computer is a standard size (home improvement) Phillips screwdriver. I have no evidence to back this up, but you'd probably want to avoid magnetic screwdrivers, so dollar store screwdrivers work great.