Hi newcomer and welcome to the Tom's hardware forum.
You can see the system requeriments for any version of VS 2008
here
Any decent processor (c2d or athlon II X2 or better), 4GB, a good monitor, a faster HDD.
If the rig is for programing and gaming, this configuration is an example of what you need.
CPU $ 99.00
Here
MOBO $ 99.99
Here
RAM $ 99.99
Here
GPU $ 159.99
Here
HDD $ 89.99
Here
PSU $ 89.99
Here
CASE $ 61.99
Here
Total: $ 700.94 + MIR + SHIPPING
Now, if it's only for programing, you can use something like this:
CPU $ 60.99
Here
MOBO $ 99.99
Here
RAM $ 99.99
Here
GPU $ 99.99
Here
HDD $ 89.99
Here
PSU $ 89.99
Here
CASE $ 61.99
Here
Total: $ 602,93 + MIR + SHIPPING
The big question is. What is your budget?, Do you want programing, gaming, video edition...or only programing.?
EDIT: GPU update price, and total for the 1st rig.