Marcusg, there will be some people that poo poo on what you are wanting to do. As long as you understand that the HG MUST be FF in order to get the sniper grade accuracy you wish, you will be sorely disappointed.
Now on the other hand if you want CQB accuracy w/o MOA, then you would be good to go, PROVIDED, the HG is timed TDC. I don't run a rig like that, but my son has a dissy that has a YHM HG rail that I can put my Aimpoint on for demo purposes.
I whole heartedly recommend the YHM HG. I've been through quite a few of the HG systems and for the money the YHM is the best buy out there. A dealer here offers awesome deals on the HG and I will recommend him to everyone I talk to at the gun shows. Brightflashlights is the guy, go to the industry section and check out his forum.
As far as Aimpoint mounts, any of the quality manufacturers will work. I wouldn't hesitate to use a military aimpoint mount either if you can get one.