I agree with grant.
I recently just did my first build and I was amazed how easy it was. I was nervous about setting the processor and heatsink but they made it so easy to do...I used this place and youtube to really get an idea on how to build a computer. I need something visual and there are great guides on youtube.
With building a computer, you need to start with a budget. Then a CPU. And base everything off of that CPU. There are certain chipsets, then pick a mobo, and then ram that is compatible with that mobo.
Then a GPU that fits that budget, along with a Power Supply that powers all of that stuff... and then pick a Case that fits your budget with the size Mobo you selected. And there you go, you have your first rig...really....you'll need a CD-Rom, HDD, and an O.S though.. so factor that in.
but...you could build that 2nd computer probably for cheaper and it would be better IMO.
Also, Is the sandy Bridge still on recall?