IAR Embedded Workbench for RX is a high quality, high efficiency not GCC based compiler in the upper price ranged. It is easy to use and comes with a lot sample projects. IAR EWRX comes with native J-Link support.
Using an IAR EWRX Project With J-Link
The following steps explain how to configure a project to be used with J-Link.
Open the project to configure
Click Project | Options... from the main menu
Make sure that J-Link RX is selected as Driver
Now the project is ready to be debugged with J-Link.