It's impossible to tell you what an individual card will produce in hashrates, only a general sense of what you can expect.  There are way too many factors that play a part in hashrate... mining software, over/underclocks, not least of all the silicon lottery.

For motherboards, I highly suggest the boards that are made specifically for mining.  They will give you the least amount of trouble since this appears to be your first real mining rig.  As for dual mining... Sia and DCR are always favorites combined with Eth.