I have my heart set on a Vitamix. I would love to have a professional version but will have to wait a while if I am going to fork over $400+ on one. I found an older version 5000 with wet and dry containers in my area for $300. Is this a good deal? They all seems to be going for about $400 on eBay. Would you recommend buying the older version, or wait on the professional? Thanks in advance!