I am beginner to home theaters and new to this site. I have been listening to Sennheiser HD280pro Headphones for a while and want to graduate into a home theater. My budget is around 500$. I want a 5.1 receiver and to start with I am okay with just 2.1 setup. I am living in a small apartment and I think 2.1 is good for me till I can get money/space to expand. Can you please suggest any receiver, subwoofer & satellite/bookshelf speaker combination (center channel if it makes a difference). I am also open to buying a Speaker system like Polk RM6750 ($450), Harmon Kardon HKTS 14($380) or Infinity TSS-450PLT ($315). Personally I would like to expand over time. Thanks in advance for your time and any suggestions.