from what i've heard Asus is going downhill. a ton of the boards they have on newegg.com have very very crappy reviews. personally, i'd stay away from them and go with something that you know is good, and won't be broken when you get it. for instance, i know of a good MSI board. but...
in order for us to suggest you a motherboard, you need to clarify on your system specs. i'm sorry to say it, but you did a very poor job filling that in. there's NO way any one of us could suggest a single board without knowing the full and accurate specs you have.
right now, i'm thinking "what the hell is Pentium 4 12" ? i've never even heard of that before.
and nickc has a good question.
do you plan on gaming, do you just need something that'll help you get buy, or are you going to do lots of video editing?
to help you, you need to help us. fill us in more and we'll get back to you with something worth your time.