1. M1911 either full size or officer model
2. Ruger 22/45 5.5 in bull barrel
3. Super Redhawk with 6.5+ in barrel
I already have 1 and 2, and expect to have 3 in the next 6 months.
If I'm limited to three then the sky is the limit for cost.
I would want at least one 1911 and either a Dan Wesson Valor or Wilson CQB. I would also want a CZ 9mm and I would go with a Rami for carry purposes. Then a S&W Model 17 for a hunting pistol.
That leaves me without a real revolver so I reserve the right to change my mind.
Glock 17, another glock 17 for when the 1st one blows up, and then a 3rd backup for when the 2nd one blows up on me
In reality, a g17, a colt 1911, and these days a gsg1911. The last one is an oddball gun I know, but it shoots well, suppresses great, and eats just about any ammo I throw at it, and since its a 22 is cheap to shoot all day.