If you get a mobo with an Intel 850 Chipset, then you need to get RDRAM, which goes in pairs like the old EDO, and it's more expensive. Intel just came out with a new Chipset, the 845, which will allow you to run regular SDRAM DIMMs, will be a cheaper solution but you will create a bottleneck for your P4.
If you want an advise, forget about the P4, and consider getting an AMD system... Don't get fooled by the big numbers that P4s run at... Get a nice little ASUS mobo with the newest VIA chipset, the KT266A (don't get the KT266, make SURE it has the "A" at the end - KT266->A<-), a DDR memory module and a sweet Athlon XP... you will save money that can be spent on a better quality case like Antec, and you will SMOKE your friend with a P4 that is running 1.8GHz @ 400MHz FSB....
GUARANTEED
Go to Pricewatch.com for the best deals, and once you chose your vendor, go to resellerratings.com to see if they are a company that you can trust...
Don't forget to go to Borders and get any A+ book, there you will find a lot of good info to learn how to build a system and all the necessary precautions so you don't fry it. Trust me, I work as a Tech in Retail, and most of the customers that think they can build a system, come back the day after with a burned mobo and processor, and try to return it... Get the book, you can even get certified.
Good luck
keep us informed
Treppiede
A television may insult your intelligence but nothing rubs it in
like a computer.