The most important aspect to building a computer is to examine exactly what you are planning to use it for.
The second would be cost.
The third would be time planned on having this project paid for and built(things are old as soon as you buy them)
5th..would be time you wish to be able to keep before having to upgrade.
6th and last would be the Operating system and other programs if any that you would like to have installed.
Now with all that in mind... the speed of a chip does not neccessarily make it the fastest or best for your useage.
Think long and think hard but enjoy the build...as it is quite remarkable for the first time and quite empressive, too...Plus take lots of shots..pictures because your friends just will not believe you.