You can, but I feel like the interface with the Roku was worth the purchase- heck you probably pay more for cable a month than the box would cost you. We had Amazon prime already for the shipping, so we get amazon movies, netflix which we already had, and we signed up for Hulu which if you buy the roku you'll get cards good for 2 free months. We are quite happy and find there is nothing to watch just about as often as there was beforeand we love the money we are saving! On Amazon there is alot you have to pay for if you want to watch - we also have alot of other channels but those three, the news channel and our PLEX channel (where we stream digital movies from DH's computer) are the ones we use the most. Our Roku is hooked up to our home wireless.
If you think its good now, wait until the update (unless you already have the Roku 3) I actually hated the old interface and switched back to using my PS3 to stream netflix and Amazon
OP- You need a PS3 to stream, PS2 can't stream