Jeff, line of credit for SGR is a reasonable approach IMHO, but that is with caveats. The interest is tax deductible as traps said and I employ the line of credit strategy for that purpose only - HOWEVER I keep an equivalent amount of cash in a seperate account "just in case" something happens to the bank and they need to call (CIBC). Also, I am confident we'll retrace back down to 1.85 before the assault on $3.00 on upwards. Like August/March, the reasons may have nothing to do with SGR and everything to do with the macro market conditions.
Regardless, I'm holding now with cash on hand and a trigger @ 1.85.
Best of luck..