I agree with you that the recent (or relatively recent) 3-in-one volumes are too small.
As far as I know, Egmont, the current UK publisher still keeps the full-sized versions of the whole series in print in their hardcover as well as paperback editions. It certainly looks that way from typing "Tintin hardcover" into Amazon's UK website, which brings up
this page.
They seem to be selling them for around £7 each, which isn't a bad price per book, though would obviously add up to a fair bit if you were buying the whole set of 23 books and getting them shipped to the States. I don't know if anyone sells the whole lot of hardbacks together at a cheaper "box-set" price, or if the US Amazon site would let you buy these UK Egmont edition directly through them, not that I know if that'd be any cheaper. (You might lose any saving on shipping on their mark-up for imported items.)
My collection is a mixture of paperbacks and hardcovers (all full size), but I don't blame you for wanting them all in hardcover. Apart from the extra sturdiness, you get the lovely portrait gallery endpapers with the hardbacks. But I prefer the matt printing and hand-lettering of my old editions, which are Methuens or various imprints thereof (Mammoth, Magnet, etc), compared to the new digitally lettered and glossier Egmont editions, so I'm inclined to stick to the mix of paperbacks and hardcovers that I've got, for as long as they last. But that's a whole other can of worms, and it might be a challenge to find decent hardback copies of these old versions anyway, so it may not be worth your worrying about
that particular distinction. And some people prefer the current glossier and digitally lettered versions anyway.
The facsimiles of the early b/w versions are indeed also interesting (I've got two or three), as is the facsimile edition of the first colour version of The Black Island (the current version being a 1960s redraw) and the partially different first colour version of Land of Black Gold. I think most of these various b/w and colour facsimiles have been translated into English (making them not really facsimiles of anything that originally existed, but easier to read for those of us with limited French!)
You'll see some of these facsimile translations on the following pages from that Amazon.co.uk page I linked to. (In fact, in some cases, such as the Broken Ear, it'd be quite easy to confuse which is the modern edition and which is the facsimile at first glance.)
But as you say, you'd maybe want to start with getting the "standard" modern colour versions, especially for sharing with kids. (Though the first adventure, Land of the Soviets, only exists in black-and-white, of course, as does the last uncompleted pencil-rough book, Alph Art.)
Hope that helps, and good luck!