I've recently decided to start upgrading my PC but I'm not much of an expert so I thought maybe you guys could help me out 
I have a Dell Dimension 9200 and upgrading the graphcs card is the main priority but to achieve this I read that you have to upgrade the PSU or the PC/card won't function properly.
I was mainly looking at the Radeon HD4850/70 but I'm not sure if it's worth the money or if there's anything better for roughly the same price along with a PSU (the card requires a 500w with mine only being 375w).
PC Specs:
OS - Vista
CPU - Intel Quad Core 2.4GHz
Memory - 2GB, soon to be 4GB
Screen Resolution - 1680x1050
Thanks.

I have a Dell Dimension 9200 and upgrading the graphcs card is the main priority but to achieve this I read that you have to upgrade the PSU or the PC/card won't function properly.
I was mainly looking at the Radeon HD4850/70 but I'm not sure if it's worth the money or if there's anything better for roughly the same price along with a PSU (the card requires a 500w with mine only being 375w).
PC Specs:
OS - Vista
CPU - Intel Quad Core 2.4GHz
Memory - 2GB, soon to be 4GB
Screen Resolution - 1680x1050
Thanks.