OK, there's one vote for the OEM guards (which, BTW, are no longer available from Suzuki).
I'm going to vote against them, here's why:
1) They have had numerous reports of welds failing - without being "used."
2) PeteSC had them on his bike and in a parking lot tipover, they bent and punched a hole in the very cover it was supposed to protect.
3) Not too sure they fill the requirement of the original post of not costing any ground clearance.
Given #3, I think the best option is forget about crash bars and go with aftermarket covers made to withstand a racing spill. There are a few options out there. There are billet covers from Moko & Factory-Pro (both pretty spendy) and cast covers from NRC (which cost the same or less than the OEM covers and if you believe the advertising hype, are stronger than billet - just not as pretty). I don't know of anyone who has crash tested the billet covers, but I do know people who have crash tested the NRC covers and rode their bikes home with nothing more than scratches on the cover.