The MEC and Gemini are nothing like each other, and the Gemini one is definitely a lot more expensive.
Innes, could you explain what you mean about getting it away from your hand? If you want it clipped in further forward on the rifle then either the Gemini or MEC will do that. If you want something that is deeper then the MEC is substantially deeper than the Gemini, which has no adjustment in this plane at all. There are a couple of Anschütz models that come close, but the MEC is the deepest of the lot.
Whatever you do, avoid that huge piece of black plastic c**p that Anschütz make. They all ought to be melted down!!!