filtering - Input field - Select multiple items from a very large list

That is a common scenario that filters for a specific grid may contain large lists of values. In most cases every item displayed in the filter list holds by itself different Metadata fields that can be used to filter the list of available items in the filter.

I am looking to find a suitable input field that can support that requirement. here are the options that i thought of.

The pattern that I am looking for should suit a web-application.

1. Multiple select Dropdown with checkboxes that will allow quick search using a name. This is similar to what is done with Excel:

2. Another options is to create a different field that will have a select button next to it that will open up a selection window. something like this:

^{download bmml source – Wireframes created with Balsamiq Mockups}

would be happy to hear any other suggestion...