I think I'd go for the upgrade model myself before spending around $200 plus shipping for 3 repacement speakers. New VP150 v3 is $434, or $391 on the Auction site (buy it now price). Sure it'll cost twice as much, but you've warded off any potential expensive problems for another 5 years. (Did that make any sense?)

https://docs.google.com/spreadsheet/ccc?...amp;usp=sharing