Vendor or Auction, is Auction, avg price

[JonJonz]

Is there an addon or group of addons that will:
- scan my inventory and mark items that sell in the AH for more than the vending option.
- give me some idea as to the current or average AH buy price for items in inventory, without having to physically be at an auctioneer?

If not, what is the next best alternative?