I don't really vary my DLs much.
That being said, I do like including "deadlift-type" movements of various styles, from the PMenu rx'd clean/snatch DLs, to sumo DL high pulls, single-leg DLs, sandbag cleans, tire flips, rowing, etc. etc. I think the variety is hugely beneficial in both motor learning and prevention of CNS burnout.
Also, noting that most things I would probably DL in real life require a stance more along sumo lines, and sumos really tax my adductors, I should definitely include them more often. Much like the "B" squats that I've been forgetting to include. D'oh.