Dont get an i5, they suck, and they have no Hyper Threading (i think thats them, or the i8) but they suck anyway, because they are just old tech sold as new plus they have some wack new socket that will be outdated soon, and yeh not too serious yet as im still in uni, but i have some unfished work on my youtube channel that i use for my lectures to give me feed back befor i hand in/fix up you can check it out here my youtube channel
but yeh, i have 23x24x23, middle screen is the good samsung, the other too are soso asus monitors, but still good
with the monitors, it all depends what you wanna use it for, imo portrait mode sucks balls as everything is widscreen these days and i dont really see what you would use it for, it would suck in maya as the tool bars are on the sides and top.
I say get 2x24 that would be a decent setup, but the bigger the monitor is the easier its on the eyes, when i have the moolah, ill get a 26 or 30inch because working in maya and ae for long really gets to you.
but what will you be using the computer for?