I have seen the 22mm Patriot clone and it compares VERY favorably with my original. I would also suggest a Kraken clone (got one of them too) but OP already has one. Replace the wack poly tank with the quartz from an original and you'd be hard pressed to tell the difference (besides the different colored O-rings)
Like ^^^ said, if the post holes in the clone Omega weren't so low it would be decent, but the original doesn't even have them, so go figure.