Looking for a $700 or less computer.

This one performs the same but is cheaper. (the graphics card is a bit worse but since you will not be gaming, you won't need it)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

The quad core is great for multitasking. if you don't multitask (a whole bunch of windows open or tabs. on my quad core I often have 10-20 internet tabs open) then go for a cheaper system with a dual core. Like this one:
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

If you want it to keep it for a while (3 or more years) I would go for the quad core.