Don't plan on overclocking as that is a little more involved that I feel comfortable with at this point.
Alright. In that case, you should go with an i5-2500 for $10 less or i5-2400 for $30 less. The K just signifies an unlocked multiplier which you won't be needing if you don't OC. Just remember, overclocking has never been easier than it is now
A good microATX H67 board can be had for a bit cheaper than that Intel. E.g.
http://www.newegg.com/Product/Produc...82E16813157234 $90 solid caps, 4 dimm slots
Cooling seems to be a really big issue as it could result in a system meltdown as such my choice for the psu.
Is this why you didn't go with my PSU recommendation? Don't worry, 500W+ is all you need, and the products I recommended are of high quality. In fact, with your choice of GPU and a non-overclocked CPU, you would be just fine with a 430W power supply from a quality manufacturer, such as Antec Earthwatts 430W. Whatever you do, don't waste money on a 650W PSU if you're not considering upgrading to components that use ~100-200W more power than your current choices.
Also, you don't really
need an aftermarket cooler either since you don't OC. I would recommend going with the stock cooler, and if you find it too loud, then upgrade to Coolermaster Hyper 212+ or Scythe Mugen 2 or something similar. (The cooler you chose is pretty low performance and overpriced.)
I have read that the best HDD are the Western Digital, true or not?
Last I looked at tests, Samsung F3 is faster than WD Caviar Black. And no there are no "cheaply built" issues, it's a good hard drive, stable and fast.
And the GPU. Is there a particular reason you want the GTS450? Can't stand AMD? The Sapphire 6870 I linked is around 50% faster for the same price!
And the memory. G.skill is cheaper than that corsair by about $15.
I still think you're paying too much for the case, considering the rest of your hardware. I'm in a bit of a dilemma here though. With your budget, I could recommend to you a 650W PSU, HD 6950 2GB, i5 2500K @ 4.5GHz, full-size ATX Z68 board and all that jazz. But since you say you will only do "some gaming" and it's "mainly for home use", that may not be what you need. Considering that, the case isn't what you need either. You're fine with a standard case e.g. that Core 3000, not a cooling beast.