Nvidia GTX 1060 3GB or 6GB are about your best option out of what is more readily available to put together a rig ASAP with all the same cards, at a resonable cost. BBT posted a video of the 6 card rig he built with the PNY GeForce GTX 1060 3GB XLR8 OC Edition
165+ GPU
1000+ MEM
~23.5mh ETH and ~268 SOL/s ZEC each @ ~60W per card.
https://www.youtube.com/watch?v=1uhSfOpvHks&feature=youtu.be&t=7295Dag won't reach 3GB until early next year, so you should be good until then. The only problem with the 3GB cards you won't be able to dual mine effectivly.
Hey ive been in bitcoin for a while but honestly im pretty new to altcoin mining, could you explain what you said about the dag reaching 3gb, also dual mining. Should I wait for the dedicated miner card that nvidia is coming out with very soon?
Get your self gtx 1070/1080/1080ti cards to mine Zcash Siacoin and DGB coin, if you want Ethereum mining go for RX 470/480/570/580 cards, if you can't find these GTX 1070 can do a good hash rate but cost more money.