Do yourself a favor though and resist impulse buying. There are good guns out there that don't cost much, but often you fight to find holsters for them and mags are expensive. When all is said and done, you might find that $350 deal cost more than a higher quality gun might have when you add up the cost of extra mags and gun leather.
This is an especially good point.
It took me years of carrying before I broke down and bough a Glock. I don't know if I was intent on being different or thought I could find a better answer, but once I bought a Glock 19, finding accessories for my edc became a lot easier. Where before I would have to spend lots of time online looking for a holster for this or that xd, I could pretty much go anywhere and they had glock 19 holsters. Same for mags and sights. Pretty much every gunshop with gunsmith services seems to handle glocks and glock parts. Pretty much every holster maker makes glock 19 holsters and pretty much every holster seller stocks them.
(The glock 19 is also a boring gun in the sense that it keeps going bang and shoots well whatever I feed it.)
Do consider that if you buy a less commonly carried gun, you will have a harder time finding parts, mags and service for that gun than you would if you bought some mainstream choice.
You shouldn't be limited to just 3 guns. The right number of guns to have is..... just one more.
J frame, K frame, N frame.