Think you might enjoy this if you don't already know them, band called Bit Brigade. Saw them live some years ago and they played some Castlevania. Really like this MAGFest show they did playing Mega Man II.
I think the Mister is cool and all, but honestly I have seen some video's exploring the difference between hardware and software emulation and the advantages of both.... I would pick software over FPGA, wouldn't mind some sort of hybrid approach but I can only imagine how complex that would be and how expensive.