First, I'll say this, my family has known nothing but Subarus as far back as I can recall. The first I remember is our white, double pin-stripe blue Yama Yagi model. That was, well, awhile ago.
Now my own family has a 2005 Outback Legacy Wagon with the Boxer turbo. I WOULD HIGHLY recommend getting a extended manufacturers warranty. We have had to use it twice within the first year of purchase (which was 2006) and it saved us $. Since then, getting its bugs cleared out, not a single problem, just routine maintenance. I swear by our Subarus, past and present.
As for the shaking around 65-70 on interstates, we do experience it, but is not a major issue. Most of the time I don't even notice it unless I think of it first. We have our Subaru balanced on a regular basis to prevent it.
Hope you enjoy your purchase!
"LIVE FREE OR DIE...DEATH IS NOT THE WORST OF ALL EVILS." Gen. John Stark. "by reason of much foule weather and Extreme Bad Woods to travel in..." From the letter of my Great Uncle, Samuel Willard (accompanied by my grandfather Henry), to Governor Dummer on August 16, 1725, explaining the reason for his return, being instructed to "range all the country", of the Wawobadenik (White Mountains) July 19-August 16, 1725. I am a 13th generation New Englander and proud of it.