1 shotgun, 1 rifle, couple or three handguns?
OK. You mentioned you already have a a SD revolver, so I won't suggest one.
I would also draw the distinction between rimfire and centerfire rifles. If you prefer shooting long guns to handguns, you might want to get one of each, instead of an extra handgun you might not end up shooting.
Shotgun - Remy 870. I don't own one myself, but probably will. They come highly recommended, good value.
Rifle(s) - One of the .22LR autoloaders. My personal preference is for Marlin's, but Ruger, Remington, CZ, and Browning all have very good rifles in this caliber. I have a
Marlin 70PSS that's tons of fun, accurate, and easy to pack. A centerfire rifle would be hard for me to recommend unless I knew what kind of shooting you might do with it. .223 Remington is a fairly versatile caliber, good for varmints, target shooting, and some home defense situations. If you don't have a particular leaning or need, you might start with that, since you'd have choices of just about every available action type made.
Handgun(s) - I am extremely pleased with the Kahr K9 for a carry gun. For a rimfire handgun, I like options, so a .22 revolver with .22LR and .22WMR cylinders works really well for me (Ruger Single Six). Everything else I have is just play, and you might like different toys. Handguns are very individual choices, and the best thing I can recommend is renting several at a range.
Best of luck with your choices, and Merry Christmas.
jmm