Best computer for graphic/web designer. Options

[turkishdog]

So, I'm that kind of person who really into graphic/digital design and web design. I'm an amateur photographer so my computer is full of photos. I edit them, etc with PhotoShop (I need legal version plz) I'm in the process of purchasing a Wacom tablet, yada yada yada.

I currently don't have a computer of my own (sad). This computer is great, but since I share it with the family it's not a good comp for my works. I have a lot of photo's and .psd files. Would you guys be willing to help me find a computer that would be best for my interests? (Hard drives, etc etc)

I love MACs, but I don't want one. I know they're great for graphic designs and such, but I also use the computer for daily things. Surf the net, chat etc. I'm waaaay, too used to the PC. So I'm looking for a great PC. What should I be looking for? Would it be cheaper to just buy a great one or just start from scratch?

I feel like a newb. (Oh, I am one, lulz.)