Dear Querist
My opinion on your queries are as under:
1.Is it good to go for appeal now and come out clean hands in DV case and pay maintenance only under 125 crpc if she file for the same?
Opinion: If she is unable to maintain herself then no need to file an appeal against this order but if there is any proof in your favour like, she is working, earning, liveing in adultry then you may file the appeal against the order, practically in appeal on maintenance matter, merely success because wife and child is the legal and social liability of Husband.
2.Paying maintenance under DV act will have any negative impact in my future when compared to pay maintenance under 125 crpc?
Opinion: She can claim in both case but entitled only one maintenance which one will be highest.
3.Once my talaq got proved in civil court, Can i file petition to stop her maintenance under DV act. Or will it be applicable only for maintenance under 125 CRPC?
Opinion: If you send the talaqnama with Iddat period maintenance and Mhar amount then only the Talaq is valid otherwise talaq is not valid in the light of Quran & law too. She will be entitle to get maintenance from you even after divorce.