Hey all,
I was really wondering, I want to create A forum.
A good one like this, but I have a problem,
What web host/Domain register should I use?
Which is the best?

Im my opinion, most will do including e.g. Hostgator, lunarpages etc.

I think forum coding is one of heavy CPU usage with large DB, so you need a strong hosting plan like Bluehost or Godaddy.

I think there's no "best" host out there since they are unique on services that they offer. Just keep on shopping around and see which ones offer services base on what you need.