Watts has absolutely nothing to do with the internal quality of the power supply.
This is why you don't want a cheap unit, which includes the TR2:
http://www.tomshardware.com/answers/id-2236978/blue-screen-death-driving-insane.html?siteFrom=EPR-8807#xtor=EPR-8807
http://www.tomshardware.com/answers/id-2194316/likelihood-psu-failure.html
Don't make the mistake of thinking name brands with good reputations always make and offer good products, especially when it comes to power supplies. Corsair, Cooler Master and Thermaltake, among others, are well known for having crappy power supplies when it comes to their budget models. Typically, most units from Antec, Seasonic, XFX, EVGA and Superflower are good but you should verify any potential model purchase is verified by either matching it's model number to a ranked unit on the tier list or finding and reading a positive review of the EXACT model on a reputable review site like HardtechX or JonnyGuru, to name a couple.
Don't use any calculators. They are not accurate. Use the GPU recommendations on the page I listed above. It includes overhead for the CPU and other components, so long as no overclocking is involved. If you're overclocking the CPU or GPU, add another 50-100w depending on if you're overclocking one or both, and how much. Clearly a mild or medium overclock isn't going to increase the demand and load like a high or extreme overclock is so just use good judgement. In most cases, if you're overclocking one component I recommend an additional 50-100w. If you're overclocking two components, increase the capacity by 100-200w. If the overclocking will be extreme, an extra 200w minimum is probably a good idea. These are basically guesswork as every overclock and the derived load will be different for every system, but it's fairly close.
If you want a very in depth look at the reasons why, to further understand, you should take a look at these:
http://www.tomshardware.com/reviews/low-cost-psu-pc-power-supply,2862.html
http://www.hardocp.com/article/2011/10/04/80_plus_irrelevant_to_you_when_buying_psu/#.Vk4SQfmrRhF
https://www.youtube.com/watch?v=uRBu5egS6Ig
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