Question CPU/MoBo Upgrade/Case Upgrade??

[toxicwarrior7]

I need a new CPU... bad (check signature for current specs). This would also mean a new MoBo, so changing to an AMD processor would be ok. Also, i have an HP Pavilion which has a kinda small case, so should I get a new one for the new MoBo? and will I need a new PSU? (mine is 300w)

 

[tennis2]

Budget?
County?