Uh oh, we're sort of hijacking thread with other ideas : )
I like the peak like Paul's - it has to be high enough so you can sit up straight, move around a little, without your head touching the tent walls. 4 feet high is about right.
If there's a pole straight up in the center, it gets in the way. Better to have two poles, one on each side, in an upside down "V", each one 5 feet long. A little heavier though with all the poles.
I'de rather have a side entry for ease of entry. With the end entry, you have to get in and flip your feet around. It's sort of awkward.
But, the problem with the side entry is that when you open the door, if it's wet, water splashes onto your sleeping bag. With the end entry, there's a small "porch" area where you can shake off your wet clothes. Also, you can operate your stove there.
Then, on one side of your sleeping bag you have to leave it free, for room to rotate your feet around and take off your boots. On the other side of your sleeping bag is a little room to put stuff.