276. Definitely! I recently played Regrowth, which has been around for donkey's years, and I'm now playing a new 1.7.10 pack that's still in... I guess beta? Maybe alpha? Its already had a load of work put in either way, and its fun.
But, I also really like many of the accumulated changes that 1.12 has collected since, and I love a lot of the mods that are around for it now, so 1.12 is also very viable to me - I think Forever Stranded: Lost Souls is one of the most original and novel packs I've seen, and I don't know if a lot of that would be possible in earlier versions!
People talk about the golden age of 1.7 - I think we're in a golden age right now! Because we can pick and choose from a huge range, and 1.7 stuff may not be updated anymore for the most part, but it is (in most cases) in such a good state that it doesn't need it!