http://pcpartpicker.com/p/tJn7yc
Went through and made some adjustments. If you want to get semi-decent performance out of your system in games like Minecraft, you'll need dedicated graphics.
CPU: The G3258 is probably one of the best budget CPUs that you can get right now. The fact that it's overclockable and contains a boost clock of 4.0 ghz (Correct me if I'm wrong) is something brand new to that realm of performance. Overall, great budget buy.
CPU Cooler: This was kind of thrown in there as a "Get it if you can" kind of thing. This is one of the most acclaimed air coolers out there, and for so cheap, it's a great way to keep your temps in check. Especially with the case, which I'll get into later.
Motherboard: I decided to keep the one that you specified. It does well enough for what you need. I'm assuming you don't plan to overclock in the near future, so this should give you solid features for your intentions. I'd recommend looking at Gigabyte if you ever have some extra money for an upgrade. They're pretty good quality from my experiences. Currently using one in my build:
http://pcpartpicker.com/p/HLNTZL
RAM: This was tricky to get, but I found a kit that should do well. Having 2x4GB instead of 1x8GB will allow you to spread the load of your tasks over twice the DIMs, which means double the bandwidth. Overally, dual channel is the way to go
and 1600 mhz should be more than fast enough.
HDD: The WD Caviar Blue has always been a reliable drive. I'm running a WD Caviar Black in my system, which just means that it's a little faster. If you have some extra money, the black version may be of benefit. I decided to get rid of the SSD because at this budget, your money could be put towards much more useful components. SSDs are sort of a luxury item when it comes to computers.
GPU: The money that I saved from getting rid of the SSD mainly went into this. The 750 Ti is probably one of the best "bang for your buck" cards out there. It's cheap, but it does what it says on the tin, so to say. You definitely get what you pay for. This is the main driving factor for getting the FPS you want in games.
Case: The Source 210 is a good budget case, and it's pretty cheap. That being said, it's cheaply made as well. It's not a bad case by any means, but if you're paying $30 for a case, it's going to look like a $30 computer. It's mainly aesthetics at that point. As for the air flow of the case, I've definitely seen better, so I threw in the cooler that I mentioned earlier. Overall, it should help dissipate heat. The case is generally something that I leave out of a build, and let the builder decide on, as it's very much a personal choice. My best advice would be to go with what you think looks best, as it's what will reflect on your entire build.
PSU: Corsair has always been good to me. I quite like the semi-modular design of this one, as ti means that you don't have to have as many cables running through your case, saving precious space, and freeing up airflow.
Wifi Antenna: Nuff' said. It's an antenna.
This was pretty much put together in a rush. I'd recommend doing a bit more research before finalizing your list, but I would recommend these as a starting point for your build.
Edit: Some things that I would try doing in order to still have a working system without going over budget.
Try going will a lesser capacity HDD. 500GB may serve you just fine initially. I've had my computer for a few months, and only used 200.
Maybe try cutting back to 4 or 6 gigabytes of RAM. I don't personally like this option, but if you really need to cut corners, this could help.
There's always the option of holding back on the graphics card, but don't expect any sizeable performance from the system. You'll have the ability to run google chrome, and maybe minecraft low settings 30FPS. This would be 100% last case scenario.
