Mining RIG UPGRADE !?

[tilted2]

I currently have this : 

CPU: Intel - Core i5-4460 3.2GHz Quad-Core Processor 
Motherboard: ASRock - H97 Anniversary ATX LGA1150 Motherboard 
Memory: G.Skill - Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory
Storage: Samsung - 850 EVO-Series 250GB 2.5" Solid State Drive 
Storage: Western Digital - Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive 
Video Card: MSI - Radeon R9 390 8GB Video Card 
Power Supply: EVGA - 750W 80+ Bronze Certified Semi-Modular ATX Power Supply

Currently mining ETH @ 31 MH/S and I know that ETH won't be minable forever, but I trust this coin long term and I want to mine more.
I know my MOBO can handle 6 gpus (true?) and I think I can get an other GPU wiht my current PSU.

How can I upgrade my current build so I can mine more altcoins? What GPU/GPUs should I get and should I change my PSU if I take your advice?
I was thinking to throw about 2000$ CAD (will do more if this has potential) = 1500 USD (yes poor us canadians, i know)

Thx

[Zionatin]

You can mine with multiple cards ? Wait untill better cards come out or maybe find some second hand ones maybe you can profit on ?
I know the RX series is very good look into that. Look at risers it makes space for the gpus to fit. The amount of money you have is fine to begin I think. 

[tilted2]

Should I consider 1060s?

[Vann]

Should I consider 1060s?

It depends on how quickly you want to get started. The quickest option would be to go with 5 1060 6 GB cards for around $260 each. That should give you ~130 MH/s at around 500 W of power @ 60-70% TDP. You also need to upgrade your PSU, as a bronze PSU running under load 24/7 is not going to be up to the task. An EVGA G2 850 W for ~$130 would give you enough wattage and connections for up to 6 1060's.

The better option would be to go with 6 x RX 470 4GB cards for around $200 each. That would give you ~165 MH/s at around 600 W or around 750 W if you dual mine. The problem is finding multiple cards in stock without getting gouged is going to be tough.