SQLQueryStress is a performance testing tool, which has been designed to allow you to load test individual queries. This tool is in Beta stages but it may be helpful for your performance testing. To read more about this tool go to the Documentation. To download this tool to have a play go to SQLQueryStress.
I have not played much with this GUI tool but I do see that it could provide some quick useful insight into your performance testing.
Here is what you can expect when using this tool. You can also configure the tool with parameters to give yourself repeatable testing.