Help me to decide for a good PSU

This is my configuration:

Intel E2140 @1.6ghz (Overclockerd @2.2 ghz)
Mobo EVGA nforce 7050/610i
4 gb ram DDR2 667
1 dvd drive
WD 500gb hard drive
2 fan coolers 10cm.

Also i want a Geforce 9800 gt.............any problem with that one???

i past this week reading about this theme and somebody said 500w is ok, others said 550w and things like that.

i`m not a hardcore gamer. i need just past the time playing some games or working with Photoshop or 3d aplications.

http://www.amazon.com/OCZ-OCZ500MX [...] 579&sr=1-1

http://www.amazon.com/OCZ-TECHNOLO [...] 641&sr=1-1

The general rule of thumg is that a high quality 500 - 550 watt power supply can handle any single video card made. A single 9800GT does not use very much power. The rest of your sytem doesn't use much power either. A high quality 500 watt power supply is sufficient.

Here's a link to a technical review of the OCZ StealthXstream 500 watt power supply:

http://www.techaddicts.net/reviews [...] th500.html