Those prices are right in line with what they are here now. Last year when I priced one out it was $10,900 + tax, and that was for a 30 Vangaurd. Both dealers in my area said that the 32 wasn't available here last year.
If you've had good luck, and are satisfied with the power of the 32's, why switch? If power has been some sort of issue, then I can see it, but for a 61" deck I'd think you'd have plenty with the 32.