Hi there R-CMan73, and
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I read in your previous post that you like c-135s, E-3s etc. Well, as regarks KC-135s, the AMT(/ERTL?) ones are the most recent issues in 1/72 scale and will make nice modles, but I believe fit is not perfect. Don't have any of the kits, so this is only hear-say. If you want to start with a real big jaw-dropping plane that is kind of new on the block, go for the Trumpeter Tu-95M Bear to the same scale. Huge, and from the pictures on Trumpeter's homepage, beautifully detailed. Not very cheap, but awesome. Only drawback: everything else might be downhill
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If you like bigger scales, I could recommend the Italeri C-130 Hercules in 1/48 (different versions available) which is a bit older but leaves a lot of options to detail the cargo bay (if you like that sort of thing). Also, the Revell B-1B in 1/48 would make a BIG and rather well detailed (though not cutting edge nor trouble-free) model.
this is just off the top of my head. Let us know what you like in more detail, and maybe I can give you some better advice. Hope to see you back often