Well, a few recommendations:
1. That PSU is not appropriate for that GPU. The GPU manufacturer recommends a 500 watt PSU or better...and available connectors of "An available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector"...The PSU you picked out is only 430 watts and only one 6+2-Pin connector.
2. For now I would recommend you going with a more expensive APU, rather than a CPU and GPU combination. That way you can save some money, and although it will not give the same performance...it will work with a lot of games.
3. I would also recommend going with a single 4 GB RAM module so that you could add another 4 GB RAM module later on if you wanted to. Since your motherboard only supports two RAM modules, by purchasing two 2 GB RAM modules, you would have to completely replace one in order to increase the amount of RAM in the system. Of course the amount of RAM supported is affected by the operating system, so this also depends on that.
4. The case you chose comes with one pre-installed fan, so you may want to purchase an additional fan to help with cooling. If you are worried about costs, then you can wait to see what temps you get after using the system a bit.