Welcome aboard, Ken. Glad to have you back. For tanks, there are many options from Dragon, Trumpeter, Bronco, AFV Club, Mini-Art and Tasca, just to name a few. The Tamiya kits are nice, and easily upgraded with lots of accessories, but have been transcended in quality and accuracy by the others. Lots of new subjects are coming out as well, adding to the variety.
As for aircraft, Tamiya, Hasegawa, Eduard, and Trumpeter, again just naming a few. It all depends upon what you like, the scale you like it in, and who makes it.
I would suggest that you look in the reviews section, or use the search bar at the top and type in the subject you like, or ask in the forums for opinions on kits you are interested in. You will get plenty of help. Some items are only available from one maker, some from multiple, so getting some input in the forum is helpful. Armorama and Aeroscale are good places to be.
Great nations do not fall because of external aggression; they first erode and decay inwardly, so that, like rotten fruit, they fall of themselves. The strength of a country is the sum total of the moral strength of the individuals in that country.
Ezr
