New Egg only ships to the USA. Don't forget that if you build a PC you have to get the OS. That can run you a few hundred dollars. It's best to get it from the OEM.
This is a good resource. Look around, so some searches. Overall it should help.
Also, what you want depends on what you plan to do with your computer: -If you plan on playing DF, you need Ram and a fast CPU.
-If you plan on playing Crysis or the like you'll need everything else and a good Graphics card.
-If you plan on doing lots of photo or video editing/rendering, you'll also need a big hard drive (to store all of your raw and polished data).
-If you are an audiophile you'll want a good soundcard to provide surround sound.
Then you need to make sure you can provide enough power and space for all of the components with an appropriate PSU and case.
Every computer also needs a DVD drive. Most dual-layer DVD-burners can burn data to any media except Blu-ray. This is important, you should make backups of your important data.
Don't forget that you need a Motherboard to put everything on.
Make sure everything is compatible with all of the connectors (CPU socket, RAM type {DDR3, DDR2, etc.}, GPU card {PCI-E, etc.}, Hard Drive connector {SATA, e-SATA, PATA, etc.}, DVD drive connector, PSU connectors, and the connectors for whatever other crap you plan on stuffing in there).
You'll also want to keep everything cool.
-If you are using something low-end (internet browsing, DF), big fans and heat sinks will do.
-If you run something high-end you will need more big fans. Inevitably, with any high-end machine, you will end up with a screaming monster, so consider water cooling which is generally quieter than fans, and consider a solid-state-drive or SSD.
SSDs are basically oversized flash drives. They offer higher data transfer rates and help make your computer zippy, they also produce less heat than a harddrive and produce absolutely no noise at all (no moving parts). The only thing is that they are expensive and low capacity.
Depending on how old your monitor is, you may want to get a new one. CRTs are limited in size and are generally less efficient compared to LCDs. However, LCDs tend to die after 3 or four years, this is because the back-light dies.
Shop around for the best price. The Internet is your friend here. Google is useful, but surf sites of actual sellers such as Best Buy, Future Shop, Staples, New Egg, and Amazon. Be sure to factor in
shipping costs.
That's about the furthest extent of my knowledge on the subject. So in summary:
-
Shop around
-Base what you buy on your
needs-The
Internet is your
friend.