New Vitamix models available reconditioned: 7500 for $399, 6300 for $379
The 7500 (aka Pro 300) is the new model that they released last year with the shorter/wider pitcher, longer blades, and more powerful/quieter motor. Sells for $529 new.
The 6300 (aka Pro 500) has been around a bit longer and is the same as the older machines except it has preset modes. Vitamix is selling it for $649 new, although Costco sometimes has it for $500.
If you're confused about all the different Vitamix models, check out this page:
If you have an old Vitamix, they'll give you $100 for it with their trade in program: