You've maybe noticed in my posts that my English is very mediocre but I'm fond of language... My language is Dutch. A very funny language, with lots of possibilities and a very living and a very difficult "spelling" (like, how to spell words).
I'll stick to your two examples, Bob; "Here is 1, 2 and 3" and "Here are 1, 2 and 3".
Here is 1, 2 and 3 > There is an obvious kind of climax in this statement. Some kind of suspens, like the spirit of 'auction', in the heart there is rhythm. There is also something as an end in this statement, an end with relief...
Here are 1, 2 and 3 > Well here you know that, once you're fully aware of the "one", - since the verb is plural - there must be something coming (in this case "two" and even a "three"). So, for me, there is not as much relief (as in landscape) than in the first example. A part of the message is already said by using the verb "to be" in plural.
Besides that, I don't like the sound of "Here are" (hey, that sounds a bit like the piano-brand Erard). I like more "Here is". And also in general, I prefer the first example. But in the end, it's up to you. Both are possible.
Kindly