Well, if you want to stay with an i5 and have the option to overclock in the future, get the i5-4670k with a Z87 mobo, and then a gtx 750 Ti as a baseline card (I only really know Nvidia, so I can't recommend AMD)
If you don't feel like you'll need all that CPU power, get an i3-4340 and an h87 mobo, as it will perform similarly to a stock i5-4670K because Dolphin is only a dual-core program.
It's really up to you, but the i5 will perform better than the i3 as a computer outside of Dolphin, but it's all up to personal preference
If you don't feel like you'll need all that CPU power, get an i3-4340 and an h87 mobo, as it will perform similarly to a stock i5-4670K because Dolphin is only a dual-core program.
It's really up to you, but the i5 will perform better than the i3 as a computer outside of Dolphin, but it's all up to personal preference