If you truly need to limit yourself to $10,000.....
1) You'll probably need to go with a receiver rather
than separates. Check out something like a
B & K 307, used. This will be the brains and
amplification for your system. I've seen them
going for around $1,500.
2) Since you've gone with a receiver, you'll want to
pick efficient speakers -- ones that are easy to
drive. I recommend Monitor Audio. Get the top
of their line, used for around $5,000 for GR-60's,
center, and surrounds.
3) DVD player -- Get a Denon 1600 used for around
$300. This will also play DVD-A.
4) CD/SACD player -- get a Sony SCD 777ES, used
for around $1,500. This is a reference quality
CD/SACD player and you can also have it upgraded
further later if you get the upgrade itch.
5) Screen -- you'll have to go with a used Sony Wega
16X9 HD ready type of unit -- get the biggest and
best you can for around $1,500.
6) Cable and Wire -- Generic 12 AWG 99.99% OFC
speaker cables. Get interconnects from an AV
site like PartsExpress or AVCables.
Your speakers and source will grow with your system.
Later, when you want to upgrade, you will start by getting better amplification, using your receiver as a
pre-amp. Next, you will eliminate the receiver and get
a legit pre-pro. Next, you will buy an AC conditioner.
Last thing you will do is upgrade your cables.