You know, I have yet to hear a truly bad DI for live. I usually use the DI out on my SWR amp, but when I use an amp that doesn't have a DI out, I will often turn to a simple little Whirlwind Imp 2 DI that costs all of $50. It's cheap but it's great for live. I've used it in situations ranging from small clubs to arena shows, and it's been completely trouble-free and always sounds good. You can spend a lot more for one, and quite honestly, the more expensive ones like Avalon, Radial, and Countryman do sound better, but not that much better in a live situation.
As for the SansAmp, it's a good sounding DI, but its tone-shaping leaves a lot to be desired.