Html & JavaScript grid component

We are looking for HTML & Javascript developer to build us a client side grid component with the features listed below. We assume that you take one of the available grids and customize it according to the requirements Some css work could be involved but not neccessarily. For information - the backend of our system is implemented with ASP.NET MVC The data will be sent as a JavaScript array of objects containing cell value, formatting options and any additional info required for the cell. Grid requirements cell formatting custom html style string may be supplied, including bold, italic, underline, align, font size column resize callback on resize, the new size will be persisted and used next time horizontal cell merging Based on server rules the system may merge some cells, this information will be supplied with cell data. ideally if it would be possible to do visual merge/unmerge a solution needed on editing merged cells, because they must be edited separately some cells cannot be merged note: a solution needed for dragging columns with merged cells column dragging some columns must always stay in a fixed position movable columns must be moved only within specific range row dragging some rows cannot be moved inserting rows there must be a possiblity to dynamicall insert a row into specific position deleting rows inline cell edit just a simple textbox or dropdown would be sufficient custom editors for complex edit operations we must be able to use custom editors callbacks each operation must have a callback function to validate and submit data each change operation may result in refreshing a part or the whole grid cell highlighting some cells are an aggregated of other cells, selecting such cells will highlight depended cells editing of aggregated cells editing such cells will turn depended cells into checkboxes where you can check/uncheck cells required some cells require a tooltip standard browser tooltip does not suit, so we need to integrate something like [login to view URL] or [login to view URL] Thats it for now, any questions and details can be discussed personally. Please reply with approximately cost and delivery time. Also we expect that you already done similar tasks and have working demos and code examples.