Since money is a major concern, I would definitely go with a motherboard with integrated video and sound. Asus is far and away the best motherboard manufacturer. You can pick up a
P4P800-VM for under $90 with the ability to upgrade to a high performance video card for gaming down the road when you have more money. To save even more money, go with the
P4P800-MX for under $60 (basically the same motherboard but without an AGP slot, so no upgrading the onboard video).
Obviously you need a case. Get one that already has a decent power supply such as
this aluminum Aspire with a 350w power supply for under $60. Aluminum will help the pc run cooler than plastic or steel.
For the CPU, you will be limited to a socket 478 if you go with either of the motherboards I mentioned earlier. For your budget I would reccomend a
3.0 GHz Celeron for under $70. This should be fine for what you need since you won't be encoding video. You can always upgrade to a $200+ P4 when you get more money.
Memory - Go with at least 1GB. You can get a couple of
Kingston ValueRAM 512MB Dual Channel Kits for under $90. Both motherboards I mentioned support up to 4GB memory, so you can always upgrade when you have more money.
Hard Drive - Serial ATA or SATA is the way to go here. You can get a great
80GB Seagate SATA for around $50. This drive is SATA II (3GB/sec). The motherboards mentioned above only support SATA I (1.5GB/sec) but all you need to do is put a jumper on the HD which switches it to SATA I. Don't forget to get a
SATA Power Adapter if you go with a SATA HD that does'nt have a Molex power connector.
Now you just need a CD-Rom.
This Asus CD/DVD Burner is under $40.
As far as a Monitor goes, there is a huge range of quality and price. You can probably find a 19in LCD flat screen for as little as $200 but it's probably a piece of garbage. A good quality 19in will be between $300 and $400.
If space is not a concern, you can probably pick up a decent used 20in CRT for under $50 if you look around.
If you noticed, all of my links are to Newegg.com, where I buy all of my components here in the US. I doubt it would be worth it for you to buy from them since you are not in the US. But its a good reference point for competitive pricing on these products.
Good Luck!