when you have 46", you will ask for 44" or 47".....
go for a bigger one or you will easily regret
two years ago i had 50" for living room and had itchy arse symptom after a year. so early this year i have a 65" to replace the 50", and the 50" to replace the 40" in the bedroom.
now cannot afford the 80+", and really no room to install anything bigger than 65" so everything seems fine now
my living is about 6'-7' from wall to wall. the 50" seems big for such distance but after installation it works fine.
have it mount on the wall you will save a few inches. get the one with narrower margin the whole tv looks smaller.
i highly recommend to mount it on the wall as i don't think anybody will have to plug and unplug cables every week. once well setup, you may not need to do it. also, you can have the centre speaker just under the tv without having any surrounding to affect the performance.
by the way, my first apartment was probably about 7' from wall to wall