Judging from the last round of pricing, since my last version of Vue was 8 Complete, it will probably cost $300 to upgrade to 10 for me--too rich for my blood right now.  I will have to wait for a sale, though I would love to be able to paint water into terrains.  I wish they allowed people who missed a version to get the same upgrade price as those with the last current version--Adobe and Corel do this.