As was mentioned, carbide, cutting depth, and speed are three main points, include spindle speed on that, too. The higher the speed, the better the cut. IT's a good bet to use 1/2" shanks as much asa possible, too.
Here's one site for router bits:
http://www.woodcraft.com/depts.aspx?pd=1054&deptid=1054
Here's a site for the raised panel bits:
http://www.woodcraft.com/depts.aspx?deptid=1141