Building a Hoster PC - Please help

[Big KJ]

Hi to all!
I do have Hoster for about 6 years collecting songs but never have the chance to really use it for real.
Now, I do want to build a desktop PC from the sctratch just to have fun with hoster.

May main questions are:
1. Which motherboard should I use? (thinking of MSI or ASUS)

2. What Graphics adapter should I use? Honesty I feel somewhat confident using the nVidia ones.

3. I want to have the preview screen in regular VGA but want to have the singers display both in SVideo and Composite video

Any thoughts?
Many thanks for your help