well i plan on playing a video games on multipule characters and i don't wanna burn out my system and a few people i play with recommended i upgrade the PSU because the 300w wouldn't be adequet enough
Well unless you plan on upgrading the video card the 300 watt unit will be fine.
I have a friend with an Ultra PSU for the last year or so and its fine, I on the other hand got a corsair and it failed after a couple weeks. With me is not a brand issue but have more than enough for what you need.
The Ultra units may last a long time, but they are underpowered on their 12 volt rails. Modern systems draw heavy on the 12 volt rail and Ultra's units fall short in this category. Corsair units are quality units, but as with anything man made defects can happen. I suggest staying away from Ultra units that is my opinion and I am sure a good bit of people on this forum will agree with me. Antec has never failed me ever I have been using their units since the mid 90's and actually still have a unit that is over 10 years old and still runs a system that has not been shut down in 5 years.