Okay couple of things,
you posted this in the general automotive section, it should have gone into "the lounge"
What exactly is the purpose of this purchase ? is it solely for the purpose of a home theater or do you have other intentions like using it as a normal radio, playing cassettes etc ?
Sony has plenty of 1000W systems, do you have a specific number ?
Since i used to work for Siedles (the agents for Sony and Bose) i know the market prices so i have to tell you that you are not in the budget range to to go for a high end system like Bose or Harmonkardon 5.1, but you can get a high end sony system for that money.
If you want to use this unit only as to watch movies on a tv and for the usage of gaming, music i suggest that you go for a 5.1 or 7.1 system. Sony hi-fi setups have good sound reproduction but they are large and placing them in a way that recreates a 5.1 experience isnt easy with the limited length of the cables that you get and the sheer weight and size of the units.
And another thing when buying sets sellers will try to convince you that the sets with the highest Wattage is best, this is not the case. Always listen to it at the max possible volume to notice any distortions in the sound. Also dont buy a set with just cause it has a higher W P.M.P.O rating, its just a exaggerated and inaccurate unit of measurement. Look for the VRMS rating on the back of each speaker VRMS is a much accurate unit of measurement.