I've got the same boat and I just bought an HDS7 with LSS. I plan on putting the 83/200 transducer in the bilge and the LSS transducer on the transom just to the right of the motor. I have a couple of filled in holes that I'll now use to mount the LSS transducer. The LSS box is going to get mounted under the drivers console. The HDS7 will be just to the right of the console. If all goes well, UPS will deliver it tomorrow and it will be installed shortly thereafter.
RH