I tend to agree with hittman's $800 give or take assessment. Not a common configuration. While not terribly rare, the Adjustable sight Security Six is far more common in the longer barrel lengths. And boxed w/shipper adds value. I just bought the same package minus the T-Grip last year and ended up all in w/shipping at $615 and felt like I got a screaming good deal on it. When I got it in, I decided it was so nice (maybe unfired) that I would keep it instead of reselling it. But had I decided to sell it, I would likely have asked $785 shipped ($750 + $35 shipping). Add the T-Grip value (maybe $25 used) and you're right there at hittman's $800ish.
But if I were looking at yours as a buyer, I would not give extra for the T-Grip since I am mostly a collector and wouldn't be shooting it. So I would end up selling the T-Grip separately.