I have a 2006 XL1200C and have a set of Willie and Max throwover saddlebags on my bike. I actually have them under the seat on the fender. The stock turn signals hold the back of the bags in place from sliding back and it works great. My bags were only about $130 or so, and are very well made. There are other leather throw-overs that work great with stock turn signals. I have a couple of pics of my bike on the "post your bike pic here" thread.
Good luck!