Hi all, I'm looking for a lightweight 24"ish external monitor to use with my 13" MBP. Looking for internal speakers and lightweight design. It will travel with me sometimes depending how long I'm gone. It will be my main computer after I sell my 21" iMac. Also, checking around is 800$ decent price to sell to a friend my 21" iMac with 12GB ram and 2TB HD in excellent condition?