Top Ten Albums by The Beatles (according to Ryan O'Brien)
1.  Sgt Pepper's Lonely Hearts Club Band - Of all them, this is the one that you can still listen to all the way through every time.  Rolling Stone calls it the best album ever made and it's hard to argue.  What still gets my attention though is A Day In The Life... I read the news today... he hadn't noticed that the lights had changed... the lyrics to that song are one of the reasons the Lennon-McCartney team is touted as the best ever.
2.  White Album - A hodgepodge of ideas from all 4 members.  It's all over the place but that is what still makes it fresh.  Back in the USSR, Ob-La-Di, Guitar Gently Weeps... classics. .... And my favorite Beatles song of all time .... Blackbird.  The Best.
3.  Magical Mystery Tour - Fully loaded.  This is almost a greatest hits on it's own, which it sort of was when it came out as a soundtrack back in the day.  Purists don't count it as a "Beatles Album" because it contained mostly singles that had already been released at the time.  Either way, this may be their best album.  The only reason it isn't #1 is because Sgt. Pepper's and the White Album are more interesting over the long term... Make sense?
4.  Revolver - Eleanor Rigby .... and Tomorrow Never Knows was 30 years ahead of its time.
5.  Rubber Soul - Revolver's twin .... here is where they started getting weird... and good
6.  Abbey Road - Their real last album, it was made after Let It Be.  The song suite at the end with the leftover 1 minute songs that they taped together is awesome.  The Beasties copied their idea at the end of Paul's Boutique and it worked there too.
7.  Please, Please Me - Their first and my favorite of the early pop albums.  And it ends with Twist and Shout.... Bueller..... Bueller
8.  Let it Be - Good, but to me it's cursed by a "break-up" vibe.  The last release.
9.  A Hard Days Night - I don't listen to it a lot, but it's a fun one.
10.  Help - same as #9
11.  With the Beatles - meh
12.  Beatles for Sale - ... meh

Still looking for a place to start?  There are lots of compilations.  My advice, skip #1's and get the "Blue Album" double cd.  That is the one to own if you are only getting one.  If you are downloading, focus on the Blue Album tracks + Blackbird + Tomorrow Never Knows + Twist and Shout + Happiness is a Warm Gun + Birthday ... you can make a solid party mix for people of all ages.