I need to purchase a new receiver and need to know which one to get. I plan on purchasing better speakers later on. I need a receiver with dd5.1 and DTS. I would also like to have at least 2 digital optical inputs, but 1 optical and 1 coax would be fine. I have two speakers that have built in subwoofers. Is there any way I can hook up two subwoofers to a receiver? Most receivers I have looked at only have one subwoofer input.