First, I recommend an AMD rig even though I have a Pentium setup - don’t ask why, it’s obvious
Second, here are prices based on my recommendations for a P4 rig:
Pentium 630 (3.GHz / EM64T / 2mb L2 cache) [8250]
160GB Seagate Barracuda 7200rpm HD [4000]
ASUS P5GPL motherboard [4500]
Transcend 2512mb DDR400 [22750]
2.1 Creative [2000]
6 & 7. Any FD / BenQ 1640 [3500] - also get a normal CDROM drive [650]
Samtron 17" Flat 793DF [6700] OR Philips 17" Flat107ts [5800]
Zebronics or VIP [3000 to 3500] OR Antec ranging from 4500
APC [2400]
11 & 12. Microsoft wired desktop 500 [850]
TV tuner cards cost around 1000 bucks I guess. Hope this helps. End of day, everything depends on what you can fit into your budget. These prices are for black hardware and exclude any tax.