Guild hall change

Im thinking of changing our guild hall from the warrior isle 1 to one of the newer ones..11k for a sigil .. but will we lose our services we already bought .. merchant ,dye and storage...
cos im not paying all that again just for a change of scenery..

Your NPCs that have been purchased will be there when you arrive in your new hall. I believe the NPC purchases are guild-specific, which means as long as you are buying a new hall for the same guild, they'll still be there.

I wish name and guild tag was able to be changed aswel... anyone knows anything about this ?

That would make it a new guild, and thus you would need new npc's