We bought 180 at BLT. The minimum was 160 also but we did 180 because we tend to stay around 10 to 12 days and a studio is just fine for just me and DH.
We knew that we would not go every single year and would skip about every third year. That means we can carry over that every third year and it lets us spread the points a bit further.
We personally enjoy Disney more when we have that break in between a grouping of trips, if that makes sense.
So our pattern is Year 1- Borrow around 10 to 20, Year 2 - Borrow around 10 to 20, Year 3 - Do non-Disney vacation, bank around 100 to 120. That means when we do our next round of 2 years of trips, we can do several longer trips or enjoy a higher point view.
BUT if you know absolutely that you aren't going to want to skip a year to allow for banking, you might want to consider more. This just works well for our style of vacationing.
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My Countdown Counting down to: Short visit to see the new stuff In the Disney Bubble
My Previous Trips 1971 Disneyland,
May 1985 WDW offsite,
Dec 2000 All Star Music,
Oct 2001 Caribbean Beach,
Oct 2003 Caribbean Beach,
Oct 2009 Bay Lake Towers, Mar 2010 AKL, Dec 2011 BLT,Oct 2012 BLT