You specifically didn't ask for my opinion, but I will chime in anyway.
If you focus on your front sight tower, you can see it, or you will see a dull hazy image of it. It will not effect your shooting in any way and if you concentrate on the target, or your crosshairs, it will be "almost" like it isn't there. It isn't an issue.
There are a lot of different mount solutions out there that will do exactly what you want to do. Most of them will work fine and you will have no problems. There are a couple reasons why I consider the LaRue the only way to go. But the biggest reason for me is not really a practical reason: I simply enjoy extremly well made stuff. It is sort of like buying a top of the line watch, or a fine sports car. Mechanically it is a thing of beauty. From the standpoint of function, it is a thing of beauty. There are times that I lean a rifle against the wall near where I am sitting so I can look over periodically and admire it's beauty. Many times I have done this with one of my AR15s and I find myself admiring the stuff I have on them made by LaRue. Some people enjoy owning the best. Often times we can't afford the best but we admire the best from afar. This is one case where you can own the best for approximently the same cost as any other GOOD solution. For me, that is a no-brainer. You go with the lastest, greatest, coolist, trickest solution for about the same money. However, suit yourself.