Budget? If you're the lucky owner of the 240 Carter IP that just sold, then I'm guessing it isn't really an issue
My Rader gyuto is the the best double bevel protein slicer that I've ever used... by a considerable margin. It's only a 270 gyuto but it does such a good job with big chunks of meat, that I haven't been able to justify a dedicated big slicer. But, I ever did, it would be something like this one:
[video=youtube;UY-WUrhda8Q]http://www.youtube.com/watch?v=UY-WUrhda8Q&feature=share&list=UUX6VEhNbmCnY8jPrF6VTzOA[/video]
[video=youtube;XSMGd_wY2Xk]http://www.youtube.com/watch?v=XSMGd_wY2Xk&feature=share&list=UUX6VEhNbmCnY8jPrF6VTzOA[/video]
As for the edge on your new Carter, I've noticed that he keeps them pretty toothy: perhaps 6000ish and at a good balance between aggression, refinement, and retention in terms of performance. In other words I think he tries to put a good, practical edge on them that's as sharp / sharper than it "needs" to be for any kitchen task.
If you want it to be stupid, scary, pointless (but fun) sharp, it will literally take <5min on a polishing stone and or strop, but you will sacrifice some durability / retention of the sake of recreational atom splitting. It's also possible to play around with compound angles and different grit combos and get an edge that will sacrifice some of the initial blazing keenness, but last for a much longer time. That's the whole point of white #1: minimal effort for wide range of results. -A very easy steel to experiment with.
I used Murray's edge like a benchmark. I used it on a variety of things until it started to fade a bit and then touched it up in a nice finishing stone till it it was popping hairs just looking at them. Then I used that edge for a bit and compared the performance and longevity to the original. When that started to go, I took it though a full progression of stones and set my own angles and combo of grits.
Just take the "Murray" edge for what it is: his edge. Then take some time figuring out what YOUR optimal edge is for the knife and your preferences.
EDIT:
Just noticed that you're in the UK. "joints' should have been a give-away. I don't think that I could justify being a Brit and a Knut and not owning something from Will of Catcheside Cutlery. He's made some breaktaking stuff, but certainly the sickest carving set of all time.
http://www.catchesidecutlery.com/gallery.html