No the best GPU for ZCASH is the Radeon 7950/ 7970/ 280x which you can buy second hand for like $50-$75.
Each will get you 300 H/s. So impossible to lose money on those.
Keep in mind they use 200 Watts however.
how 300 hashes are faster than 1100 ? we are not speaking about BEST COST RATIO but op asked whast is FASTEST CARD not more efficient or faster roi...