I would agree with you but the NS-2 is missing a string

And yes, an NS-5XL is on my short list of possibilities but there are a few others like the Forte 5 and USA bolt-on 5 that keep getting me thinking. Those are the 3 I am down to and deciding on.
I never was a 5 string guy until playing that blue Euro 5LX that I have and now it seems like I can't play without that B string. I know it's not for everyone but I was playing along to some old Black Sabbath songs last night that are tuned down to C# and playing it on the 5 string was great and didn't require me to change tuning.
Just to describe the "thunder" of the Spector B string since that is what I refer to it as. I bought a Line6 Bass Pod XT to mess around with and cannot get the thing to not clip when using the B string unless I add some compression into it. I am still messing with the thing but so far, that is the only way I can get it to not clip. I admit, I bought this Pod because Alex Webster mentioned he recorded the new Blotted Science CD with just that and his Spector bass