External Hard Drives

I am looking into getting an external hard drive for my work machine. One that I can literally just push a button and it will back up everything.

I am currently backing up on DVD’s and it takes a long time. A reeeeaaaallll long time.

So my question is:

I have $200-$250. I have to use tigerdirect.com because of a contract we have with them.

So who is the lucky drive?

I dont know much about them. All I know is that I have to go USB because I dont have a firewire port.

Thanks in advance.