So I finally broke down and decided to get OS X Server and run it so I can VPN, Host, etc....

Question is....Do I install it on my mini Mac that I want to become a server or wait till i purchase a new MBP and deligate my older MBP to become the 'portable' server? The only real advantage is that the MBP is an Intell and has a gigabit ethernet port where my new MBP will also have it and take advantage of my gigabit network only while at home?

There is no real need for speed over the internet as it will only allow a certain speed anyway and that is where I would use the speed part.