Looking for a 400+watt PSU for computer.

Hey guys,

I'm not extremely computer literate, I'm actually buying a computer from newegg as a present for a medium-end gamer who only plays about once a month on games like Team Fortress 2, League of Legends and a plethora of other steam games so as far as I know the graphics card is fine, but I've read reviews saying that the 300w psu for this computer is trash, and I don't have time to build a computer as time is a factor in this purchase unfortunately. The one thing I can do is upgrade the PSU before I wrap this computer up and gift it because I don't want to have any problems with it, but from what I've read it's somewhat difficult to find a power supply that has enough molex adapters. I just wanted to ask the TH community (since you guys seem both polite and quite knowledgeable) what a decent 400 to 450 power supply would be for this computer.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

I currently cannot have the card, mobo, processor, or ram upgraded but this should suffice for the individual in question for at least a year or two so they can have fun upgrading it themselves (since it is fun to them). I'd like to keep the price range between $0-$50 but if there's something that's immensely worth it in the $60 range I wouldn't mind spending a little more money, but $100+ is out of the question unfortunately. I'm just trying to make this Christmas worthwhile, and thank each and every one of you in advanced for your help.