Creating a catch-all blog for other blogs

Hello wordpress gurus,

I’ve been using wordpress for some time. I have a team of four people and we all share a single blog. Now, we’d like to have our separate blogs, but still keep the domain. I found out about the Multisite ability wordpress has and I’ve read the instructions, seems easy enough to set up. The thing is, imagine we have a domain name such as this:
http://www.mysite.com

Using the multisite ability, I’m going to setup four subdomains like this:
user#.mysite.com

My question is, what will appear if I simply type http://www.mysite.com into the address bar? We’d like this to be another blog which unites the content of all other separate blogs into it. Also, we’d like this blog to contain links to the sub-blogs such as “User#’s Blog”.

Is multisite the best option for what I seek? I was searching other ways such as actually installing four separate blogs independently, but then, how could I unite the posts into the main blog?

Thanks in advance,

Tiago Costa