I read the topics on choosing a power supply. I still can't decide what to pick after an hour on new egg. I need a cheap decent power supply, as long as it runs the computer. I will primarily use it for gaming.
Most people do as you appear to be doing, that is looking for the smallest cheapest PSU you can find. My advice is exactly the opposite. I think everybody should use the highest wattage quality PSU you can afford. I believe it's the cheapest insurance policy you can buy for your new build. It will yeild benefits you will never know about because of problems you won't have and can be re-used for years to come.
Both aren't quality as you notice the lack of 80plus certification and active PFC. Also neither brand is known for good PSUs. You'd be better off shelling out an extra of $20-30 now instead of replacing a couple hundred dollars worth of parts because you had a bad PSU.
I agree with the above. Neither of those PSU's should go anywhere near the inside of a PC. Picking a quality PSU is the key to a stable system. This PSU would easily power the system for a reasonable price:
400 watts sounds pretty low to me. Have you used a power supply calculator to determine the actual amount of power your components will need? You can find one here http://extreme.outervision.com/psucalculatorlite.jsp. Something else to keep in mind is that it's typically recommended that you keep approximately 25% power in reserve. So if you calculate that your computer's components will use 400 watts, you absolutely do not want to buy a 400 watt power supply, because they are not made to run at full capacity all the time. You should buy one that is 500 watts or so, which is 25% more than what your computer will be constantly using. Of course, you may also want to consider any hardware upgrades you may do in the future...adding a second, or a more powerful GPU, or more hard drives, all will increase the amount of power the PSU is needed to output.
I have a question regarding Corsair power supplies: I notice that the model numbers are prefixed by either HX or TX, with the HX supplies typically costing more. Are they 'better' than the TX? Can anyone tell me exactly what the difference(s) are between these two models?
One of the differences is that HX PSUs from Corsair are modular. There might be other differences in how they were made and by what OEM but the only difference that typically matters to consumers is the modularity.