Praxis, you might want to mention the brand names when you post specs.
Getting back on topic here, heres something I whipped up real quick off of newegg.com (I deal with them all the time and they are VERY reliable.)
Foxconn CasEdge Case with 400W Power Supply - $88
AMD Athlon XP 2800+ "Barton", 333MHz FSB, 512K Cache Processor - Retail - $121
ASUS "A7N8X" nForce2 Ultra 400 Chipset - $83
2x Crucial 184 Pin 512MB DDR PC-2700 - OEM - $186.00 (You WILL need atleast 1GB for video editing...trust me, I know.)
AOpen nVIDIA GeForce FX5700LE Video Card, 128MB DDR - $87
Maxtor 120GB 7200RPM IDE Hard Drive, Model 6Y120P0, OEM Drive Only - $86.49
NEC 8X Black
Dual Layer DVD+/-RW Drive, Model ND-2510A BLK, OEM BULK - $74.99 (DAAAAAMN good deal on that sucker!)
Leadtek PCI TV/FM Tuner Card, REMOTE, Model "WinFast TV2000 XP Deluxe" -RETAIL - $43.89
Microsoft Windows XP Professional with Service Pack SP1a - OEM - $141 (Its $84 for the student/teacher version...which is the same thing, only cheaper.)
Grand total: $ 911.37
Just FYI, you will not need anything more than a 400W power supply with a rig like this. There is no way in hell it will even come close to eating up 400W of power unless you slapped in a dual processor rig with a shitload of fans and lights. I have a very similar system running on a Foxconn
350W power supply with no problems whatsoever.
Now you can obviously trim it a little by going for a cheaper case, but I'd stick to the Foxconn line if I were you. They tend to have lower priced power stuff that give you the best bang for your buck.
Note: I've never been asked for my student ID number when buying academic software (yes, I am an actual college student) so try for the student edition if you can.