RAM:I would recommend kingston, crucial or some other more reputed brand over this one. 4gb vs 8gb, it's 20$ more, it's not really a big waste of money (even if 4gb is enough for most today, who knows what will be considered just enough in 3-4 years)
CPU: nice performance, 4 core doesn't bring better performances in games as they cannot spread the load across more than 2 core (some can't even spread the load on 2 cores), however, some games in the near future (like BF3) will take advantages of quad core processor.
Board: msi is an ok choice, asus is generally more highly regarded (and gigabyte since asus acquired 50% of them), it's quite easy to find a mobo that will fit in the case since atx cases can fit both atx and m-atx board which represent like 99% of the board available on the market. P67 chipset can be a good choice if considering an upgrade the following year or so since they are supposed to be compatible with ivy bridge (next release of cpu), otherwise, you can easily find some good h67 with plenty of feature.
GPU: the 460 is a good one, the 6850 is roughly equal in performances but consume 30 watt less power wich translate into less heat, less noise from the fans and less strain on the psu (although this is far to be a concern with a 620w psu) and more overclocking capabilities
