Did you choose the FH-X700BT just because you want to fill the double DIN opening? If so, how important is it to have a double DIN rather than a single DIN?
If you insist on a double DIN, I would take a look at the JVC KW-R900BT. If keeping a double DIN isn't a concern, take a look at the Pioneer DEH-80PRS. If SQ really is your focus, I would definitely choose one of those over the FH-X700BT. I'm sure lots of other recommendations will come regarding all of the equipment the source you select will be feeding.
If you insist on a double DIN, I would take a look at the JVC KW-R900BT. If keeping a double DIN isn't a concern, take a look at the Pioneer DEH-80PRS. If SQ really is your focus, I would definitely choose one of those over the FH-X700BT. I'm sure lots of other recommendations will come regarding all of the equipment the source you select will be feeding.