Open views content in new window?
In views there is an option called Rewrite out put. You can use the rewrite out but as link and Provide the link as well as the target.

If everything is going through views then you can change the path of your content to reflect the path of your view using the pathauto module and use a breadcrumb module that would allow you to create breadcrumb from the path this way the path to the main view would be displayed in the breadcrumb for better navigation. You can take a look at the breadcrumb module