petbat,
Welcome back to the modeling scene!
I will ditto J-Hulk's suggestions and add a couple I've built, or yet to build, but I know will turn out real well OOB. I find they are quite accurate with lots of detail out of the box; and fit is usually excellent:
Academy Merkava II (with or without mine plow)
Tamiya T-72
Tamiya Marder III and IIIM
Tamiya Wespe
Academy Warrior MCV
AFV Club M-18 Hellcat
AFV Club Walker Bulldog
AFV Club FV-107 Scimitar
Tamiya Quad Gun Tractor, 6-pounder and limber set
Tamiya StugIIIG
Tamiya PantherG, including steel wheel version
Tamiya PZkpw IV Mobelwagen
Tamiya Leopard 2A5
Tamiya Japanese Type 90
Tamiya M1A1 Abrams with mine plow
Tamiya Jagdpanther
And since it Christmas you might as well go for broke: 1. Tamiya Famo or Famor with trailer. There are also 4 Aber sets for this thing with resin add-ons in addtion to the brass stuff. I got the Famo with trailer when I graduated from college; now I'm after the Aber parts, and I'll start building.
2. Tamiya M26 (?) tank transporter with or without trailer. Shermanfreak has pictures of his build of this thing in another armor post. This is a great kit.
This should get you started, along with what all the other posters have offered or will offer.
Gip Winecoff