My sister has "The Beatles 20 Greatest Hits" on vinyl which I got a taped copy of. It surprised how many of the songs I already could sing along to every word of! I would still have been at primary school (or just going into secondary school - so around 12).
Then the Anthologys were released so the first Beatles CD I got was Anthology 1 as a Xmas gift from my parents. This would have been 1995 so I would have been 13.
From other family members I got cash which I used to buy the Magical Mystery Tour CD, my first original Beatles album (ignoring the fact it was only an EP in UK!). Why I picked this over others I can't remember but I think I Am the Walrus may have been the reason.
My final one would be Love. But my final orignal album was The Beatles (or White Album). I had a very good copy of it on tape which I played endlessly then when at Uni I found the 30th anniversary edition (2 years after the 30th anniversary) for £10 and I snapped it up. I always wonder why I left it so lon to get it as its one of my favourites but at least I got the special edition.
Which is a long way of answering MMT and White Album!