If you really interesting in the DIY idea, I would suggest getting a kit.
Two stand out as very good options.
The
Vance Dickason home theater kit at PE. (
Manual)
You would still need a subwoofer at this point, but for another 300.00 you could get a Stryke AV15 and a 250w plate amp. I would fully encourage you to build your own subs. The Stryke AV15 can be ordered without the stryke graphic and is very similar to the TC Sounds sub used in the SVS top of the line sub. Except that it has a bit higher excursion capabilities.
One other option would be to buy everything in that kit, but build your own enclosures. This would allow you to do the whole thing for under 1000.00. You could also build 1 pc at a time, or start with the three front speakers or however you wanted to do it.
One thing I might suggest is two upgrade the rear speakers to be a direct radiating speaker (just like the left and right speakers) rather than a Dipole. I, personally, prefer the dipole speakers, but most people don't.
Vifa Kit Audax Kit Each of the above would also be excellent choices.