Add numbers in a column that meet criteria and find the maximum sum

Hi All,

I'm developing a spreadsheet for a nonprofit that provides feedback on their major fundraiser/auction. I'm trying to create a formula in a cell that will look at the bidder #'s in column B and add the value of the their purchased items found in column C and return the number of the bidder that has the largest total value of purchases.

This can be done with a pivot table and give a table of all bidders, their total amount paid for items, and the number of items purchased.

thanks for your assistance.