Used to be into OverClocking so we learned a bit on the way on computer stability and hardware. The P4-AMD-Mac and other platforms seem to be really good for doing video editing.

Memory prices on DDR is fast falling and other memory platforms, so memory prices now are cheaper than ever before. Good graphics acccelerator, Sata drives,Raid hard-drive options for multiple HD's etc.

But one thing I've found myself overlooking and its easy to do, is if you build your own rig is the Power Supply. Good quality supply is near a must as the P4's and AMD-Mac newest processors are a bit power hungry, especially using multiple DVD-CD writers, lighted fans(no longer use these) graphics cards & etc.

No need to over-clock (can overwork your hardware) in my older years as speeds passing 3.4Ghz is now the norm , but if your Puter starts have stabilty issues, having to re-boot to gain OS (Operating System) stability the power Supply may be one thing overlooked or your computer Case with inadequate cooling. The higher Ghz the more important heat dissapation is an issue.

The Thermal-Take case, Xaser III (many great cases out there) was on sale and has a solid chasis (aluminum offered) and multiple fans and temp via LCD, and fan controllers. Quiet enough to not wake up the spouse at night if editing mpegs late at night..Graphics Cards I give up on the end-less race for the fastest & latest and now wait till one's a year or so old, then save $$ on new purchase.

There's a lot of good options out there and prices continually drop, and become a more realistic & affordable option to the end users.

Many good cases and hardware but don't overlook your Power Supply..& thermal solutions. Mac's are looking to be an interesting platform as well.