SJS, you have a very valid point about control. BUT there are many valid reasons NOT to have a TV. Leave the frumkeit aside for a moment, and read Rabbi Keleman on TV in To Kindle a Soul (great parenting book to get, BTW).
And bringing frumkeit back into the picture, you may be too young to remember old time TV. Not that I think we can learn middos from the Three Stooges (actually, horribly violent) and old time TV comedy was full of double entendres, but then father knew best. Now fathers are irrelevant, or if present, they know nothing. (And think twice about bringing the Berenstain Bear books into your house too.) The point is, I hope that you think very, very critically and never leave the thing unattended.
I grew up with one and I don’t ever plan on having one in my house. Yes, a computer offers lots of viewing opportunities. Even with heavy filters I was able to watch part of the presidential conventions. But I don’t think I’ll be doing things like that again so soon.