Wait for the christmas sales/black friday/cyber monday. If money isn't any problem to you though, then by all means.
Your listed games are extremely modest. You could probably max them with something along the lines of $600-700. The only problem is emulation. A pretty powerful CPU is going to be needed to run at least 99% of any emulated games at full speed.
If you don't mind spending the extra $80-100, an SSD as a bootdrive will do wonders.
I'll put full trust into kago, shugi, or another regular to pop in with a whole build laid out for you since
I'm willing to bet my left nut they'll tell you to wait for the sales too though.