It depends, if you are looking to upgrade your computer after some time then I would recommend the 365w power supply if not then i guess the 301w power supply would be fine.
The whisper 300W will be fine. The only reason to go for a higher wattage PSU would be if (like Tropical mentioned) you think you might start upgrading it considerably.
Comments
I like the PSU in your sig though. The Antec True Power 430 is what I just purchased . . . nice PSU!
~dodo
I'll get them the 301.
I would go with the antec, but I don't want to spend 50 dollars on the 330w