...what type of computer and peripherals do I need to experience MMO to the utmost?
To get optimal performance, you're gonna need, as far as, computer processor specs... ...a dual core or quad core Intel CPU, a 3D video card with (at least 1) gigabytes of video ram, 4 gigabytes of ram for the Operating System (Windows i7) itelf, a fast hard drive with lots and lots of terrabyte space capacity. The works. Essentially, a hot rod PC.
To get optimal online performance, you're gonna need a wireless, DSL, ethernet Internet Service Provider.
You have all of these 'things', internet latency will never be an issue.
What will be an issue are the eventual online cheaters that exploit glaring flaws in the program, hackers and bullies that will ruin the experience for the casual, novice gamer; it'll be fun for the 1st month or so, then the game will be ruined by online pyschos.