Is there a view for top selling products, including product kits?
easyrec for ubercart module provides the functionality for most selling products(most bought items) and it also provide the following options as blocks.

Available Blocks

easyrec: other users also bought
easyrec: other users also viewed
easyrec: recommendations for user
easyrec: most bought items
easyrec: most viewed items



  To use the "easyrec for ubercart" module a shop owner needs access to
  an easyrec server. It's possible to register a free easyrec account at
  http://easyrec.org/ if the owner cannot host his/her own. After
  creating an account on the easyrec server and a 'tenant' account for
  the specific shop, the shop owner just copies the tenantId and apiKey
  into the drupal module's administration interface to enable
  recommendations for the ubercart shop.