Most HTIB systems will come with a DVD or Blu-ray player that also has input connections for various other peripherals like Satellite/Cable receivers, Video Game consoles, etc. They will typically include all the speakers you need for 5.1 surround sound (front left/right, center, back left/right and a subwoofer).
You can get a decent HTIB system that supports Dolby Digital and DTS for $300 - $500 USD. If you want a Blu-ray player instead of just DVD, it would be $500 - $700 USD. Even though you said Blu-ray was not necessary, I would recommend it in this case since the cost is marginal relative to your budget. I would further recommend that you get an HTIB system that supports HDMI version 1.3.
HDMI cables are relatively inexpensive. You can get 1 meter (3 foot) interconnects for $10 - $15 USD. You'll want one cable to connect your HTIB to your HDTV and an additional cable for each peripheral you will connect to the HTIB system (assuming those peripherals support HDMI). Three or four should do it; total cost $50.
If you don't already have something on-hand, you will also want to consider home theater furniture. You most likely already have seating in place, but you may want to build the cost of a TV stand or mount into your budget. While the most popular stands are in the $200 - $500 range, you can spend much more depending on the size of your TV and your aesthetic and storage needs.
If you haven't already considered it, you might want to look into including a Gaming Console in your home theater budget. These can be had for $200 - $500 USD and these days can do much more than just video games. Today's modern consoles can be used to connect to the internet, browse websites, and watch internet video from several different providers such as Netflix, Microsoft Xbox Live Marketplace and Sony Playstation Store.
There are several other peripherals you might want to consider for your home theater:
In addition to making sure you have HD service coming into your home, you should also check the settings on your HDTV and all peripherals to make sure they are set to output/display HDTV resolutions. Instructions for doing this vary by device, but most are included in a "Setup" menu of some sort. Make sure that you set both the output aspect ratio (16:8, widescreen) and the resolution (720p or 1080p, depending on your set capabilities). Matching the aspect ratio and output resolution will ensure you are getting the most from your new home theater.
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