I have the HiTech mount. There are two versions, one with a flat rear end and one that has two set screws at the rear. I have the set screw version and it works really well, it's a very nice design. But it is awfully expensive. I've used with scopes and with holosights. I settled on holosight useage personally.
I bowed to internet pressure on a different SKS and installed a Choate. I immediately regretted it. It does work as advertised, but I really hated having permanently altered the rifle. The Choate also rides high. It was too high for my tastes and I removed it, leaving holes in my receiver. Happily though, the holes left behind by the Choate installation do not affect the operation of the rifle.
I recommend thinking hard about installing the Choate. And also take a good look at Tech Sights as well, those are great.
If you go with a receiver cover mount, removing the original latch pin and replacing it with a bolt and nut will tremendously improve the stability of the cover.
Both the HiTech mount and the Tech Sight aperture sight force you to remove the latch pin anyway.