Advanced Search Engine for Wordpress

Read before bidding!!! Need someone to implement a better search engine for Wordpress with several features: - Ability to filter a search by any combination of categories (both parent and child) - Ability to filter a search by custom meta data RANGE (it's a numeric value). Posts currently have a numeric value for 'Beats Per Minute' on them. You need to be able to filter search results for a beats per minute range of 80-90, for example. Decimal values must also be taken into consideration (i.e. 70.5 to 73.86). - Ability to filter search by custom meta data YES/NO values. - Ability to filter a search by post authors. In additon to this search tool being on its own page, this search must be built onto the sidebar as a tab (try searching on [login to view URL] and you will see what I mean). Our current quick search must also have one drop down menu to let users search in a single category as an option.