I have a Late-2008 Macbook White (MacBook4,1) model, and my AC Adapter broke.
Now I want to buy replacement adapter, but since I am going to upgrade to a MBP13 or MBP15 in the next 1-2 years, I want to buy a compatible AC Adapter that works with my MB white and with my then-bought MBP15/13. The reason is simple, when I buy a new one, I'll have a spare adapter. I don't mind using a MafSafe1<->MagSafe2 adapter with either the MB White or MBP.
What is the model number of a compatible AC Adaptor that I can buy? I only want original Apple products, as my adaptor that broke was a non-original and it broke after half a year. As I always buy used Macs, so I am only interested in compatibility with devices that are available (or have been available up to) today and don't know if an 85 watt adapter would work well with any Mac.