I too have had lots of other cars including about 5, 7 series BMW's, which until I got my LS400, I thought were the best big car (on a sensible budget) now I know, I was wrong.
I keep getting the urge to sell my LS due to escalating fuel costs, but I just come back to, "no other car will drive like it does" and my family (including my dad) keep pointing this out to me.
So again, I'm back to keeping the LS whilst I save up for an LS430 / 460 / 600.
In short my LS has 215,000 miles on the clock and drives better than a 7 series with a third of that.
When I'm out in it, the power, silence and ride remind me why I keep it.
Thanks
Mike