I really do not see what the point of you changing box would be Vix works on these boxes yes they are not supported by the group but what does that matter that is Vix team issue.
Surely this more of an issue for the box owner, how long do you think Zgemma will they keep modding these image releases, and supporting the box ?
Rather than getting into the whole Zgemma running the Vix image issue
On line updating on official boxes ??? That's a big plus.
Golden Interstar LX1 is a single tuner and slightly cheaper than the twin tuner LX2 if you are not bothered about recording.
VU Zero (Single tuner) and Miraclebox also do single and twin tuner boxes similar to the LX boxes, they are a bit more expensive but have Samsung tuners.
These would all be good choices within your budget.
I would go for something like that, flashed with the Vix image,
Compared with the price of the Zgemma
I personally would and do pay the extra for genuine support and a two year warranty