First, what will be the distance between the monitor and you? Frankly, 20" BenQ G2020HD is more than you need.
You're right, E2200HD has built-in speakers plus HDMI port. HDMI is useful if you think you will get things like a gaming console or bluray player later on. It also comes with inbuilt speakers which are shitty and most people don't use it anyway, but it's still useful for some.
Keep in mind that E series is also discontinued now.
I suggest stick to the G series. Which is newer.. but without HDMI and speakers.