It depends upon how many points you would need. With a 25% discount for DVCers off rack rates for a cash stay, it would almost certainly be cheaper to rent points. If you have an AP, you may be able to get a better cash rate that is close to the going rate for renting points. For cash reservations there is a one night deposit required at time of booking.
Incorrect.
A June use year starts June 1, 2015 and June 1, 2016, respectively. A May 2015 reservation falls in the June 2014 use year. You can not borrow June 2016 points for a reservation in the June 2014 use year, you can only borrow 1 year ahead. The May 2015 reservation CAN use points banked from 2013, current June 2014 points or borrowed June 2015 points. I have a June use year, too. I am banking 2014, using 2015 and borrowing 2016 points for a June 2015 trip for 22 people.