Power supply GPU Upgrade

[Dr_Platapus]

Hello,
I want to upgrade my Hp Pavilion Elite m9150f Video card

http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=120&prodSeriesId=3644723&prodTypeId=12454&objectID=c01301711

I want to find out if The powersupply will be sufficient for a XFX AMD Radeon HD 7750 Single Slot card.The power supply is said to be 350watt but I wold like to know if I need a better powersupply

Specs
-Intel Core Quad e6600
-6GB Ram
-Geforce 8500GT
-TV-TUNER
-Wireless USB Card adapter
-500GB Hard Drive

Also can I move the hardware to another case

 

[surbhit]

for 7750 a 500 Watt power supply is enough even 460 for that matter but it is always useful to get 600 watt or 650watt just to be safe and also keeping in mind the future upgrades