I've never had Pelikan 4001 Royal Blue or Blue-Black feather, but the former is definitely not lightfast or in any way permanent at all, and the latter doesn't work well in all pens and may chew through plated nibs if you're unlucky.
If your budget allows for it, the single most reliable pen I have is my Pelikan M400. Has the benefit of looking very important and classy, but you definitely pay for that, too.
The Platinum Century is cheaper and has also proven to start pretty quickly, but I don't like that one nearly as much. Also likes to collect condensation on the nib, which looks pretty meh.
I've also had very little issues with my trusty old Lamy AL-Star, but that's probably not quite classy enough as a signature pen.
Same goes for the sleek, small Parker 45, along with being an older, out-of-production pen.
I also vaguely remember the Faber-Castell Loom as being quite reliable, but I'd have to get someone to confirm that, as I haven't used mine in ages. It's also a somewhat odd-looking pen.