I'm confused on internet speed and what I would be able to do with the Roku HD and my present equipment. My internet download speed is only .54mbps (speakeasy test). I have a wireless connection here in the house and would like to be able to stream Netflix movies. Radio would be nice too. Don't need HD or SD for our TV. Would it be worth my money to invest in this. If a .54 mbps speed won't work, how much do I need. Thanks.