If you were already leaning toward the CTS-XHP manix, I would go for it. I had one, then traded it cuz i didn't know what i was doing, and am really kicking myself now. From my experience, it had really good edge retention. Plus its a FFG blade, and that leaf style that you said that you liked. The ergonomics and jimping on the knife are just fantastic. I'm not sure if this is on your radar at all, but have you looked at the Paramilitary 2s? They use s30v, which is a pretty good steel...not a super like m4 or zdp, but it will still stand up to a lot of use.
I know a lot of people mention the sages. and i have to agree that they are just great. Even tho they are made with USA steel, it still bothers me when I see that Taiwan made lettering on the blade. They do have leaf blades and are full flat ground s30v. They are all in all a pretty good package. However, if you said that you don't like liner locks, then i'm not sure if you would care for the sage 1. It has a liner lock. It feels strong enough during use, but its not a blade that i would ever be using hard...thats a job for my buck 110. which I've cut sheet rock with, pried with, and done light hammering with. ITS A TANK!
Now to about the GB. It is a good knife and is shaped and looks like a hard use folder. It has a massive liner/frame-esque lock and a serious blade on the end. However, the cf is just not as aggressively patterned for hard use. I personally think that if they put some peel-ply cf like on the s90v sprints or on the stretch II cf, it would make it a much more heavy duty folder. Many have said after getting it that it is just a little too nice to use hard. Aside from that its probably a great blade....the Taiwan thing again.
The military is also a good knife, but i just find it a little too big to use in most places. People just freak out too much. Its also a pocket hog. Thats why a prefer the para 2. I like the compression lock system much better as well. It seems much stronger to me.
I guess thats all for now. A big thing is to really know all about the blades you are comparing. If you still don't know about x-y-z, then you should probs do some more research. This forum is a great place for that, and youtube is really good too.
happy hunting and good luck on your next spyderco buy!