Pistol Purchase Advice

I think I would like another pistol or two and am looking for some advice.

Here is what I have:
S&W 686 .357 revolver - 4 in Barrel
Antique Hi-Standard Target Pistol .22LR
Helwan 9mm copy of Beretta M951 (Egyptian)
Antique S&W Govt. Issue WWI .38

I feel like my collection is not very functional. At a minimum, I'd like a nice quality and reliable auto as my primary home defense gun. Also, shouldn't everyone have a .45 1911?? What about 9mm too? Maybe one auto not so huge, maybe a medium to small size.

I'd like nice guns, nothing off-brand so to speak. Not the most expensive, but money is not a big issue. Think middle-class to upper middle class as an analogy. (THink 3 series BMW, not 7 series)

Can you help? Which two pistols should I buy?

Thanks,
G