Let's see:
The PSU (RM450W) is a very good choice. It is a high-quality PSU.
The mobo. The CPU you want is supported, so are more powerful chips in case you'll want to upgrade later down the road. There are enough SATAIII connections, there's gigabit LAN, USB 3.0, support for 16GB of RAM, NO OVERCLOCKING support (it's an H81 Express chipset so unlocked multiplier (K-edition CPUs) chips will not be overclockable unless you increase the voltage and thus reducing the actual lifespan of the chip. If you don't plan on overclocking, no need to be worried about it. There' also no multichannel sound chip - you only get stereo output so You'll probably need a PCI-based sound card or a 2.1 sound system at most.
There's also an internal USB 3.0 connector which is nice in case you want additional USB 3.0 ports.
The Hard Disk drive is just fine if that's the capacity you need.
The 750Ti is the best GPU you can get that doesn't require a dedicated power connector form the PSU. Your PSU can handle a more powerful GPU, no doubt. I'll try to build a system within your budget and see what I come up with.
If your budget is around $1000,
this is a very powerful configuration.
It is thought in a way that would allow you to keep the system for longer without upgrading things too soon. If you do happen to need an upgrade a few years down the road, you'll surely have expansion options both for a more powerful CPU, double the RAM and adding more storage.
Also, pay attention to what hard drive you're going with. Western Digital and Seagate(especially) have higher failure rates for their HDDs since the flooding in Thailand. Hitachi drives have the lowest failure rates on the market. I used to be a Seagate fan, until I had to pay $1000 to Seagate to get my data back from a failed Hard Drive. The warranty is there, but it's for the drive, NOT for your data. Pay huge attention to that if you value your data, otherwise your pockets could end up bleeding for no real reason.