I use the Black Dog skid plate. The thing is a kick ass monster - serious protection for everything under there! Very well built, with secure mounting. It does not simply screw into the wimpy little OEM screw holes. I love it.
That said.... it wraps up on the sides to protect the pipes, and it will cook your feet in the summer. Today's high here is 105, and this thing is toasty. Maybe this will not be such an issue where you live.
Worth the money I say!
'12 R1200GSA, '85 K100RS, '75 R90/6
NEEDED - REAR WHEEL FOR A 1200 GS ADVENTURE - PLEASE PM