No don't snort the tram, i've had weird reactions when crushing up ultrams or even ultracet's. And not just snorting, even eating half an ultram made me have hot flashes/chills/cold sweats and a general feeling of malaise, however when i take the tramadol pills whole i feel pretty decent (as decent as one can on tramadol).
So i highly recommend AGAINST snorting them.
And as for the mix i'm guessing it would be OK but do a quick search on BL and see if anyone else has done it or if there are any threads on the subject and if not check out erowid's tramadol vault and erowid's DHC vault (experience report vaults for both check out and see if you can find any combos of the two).
If not check out the drug interaction checker at drugs.com:
http://www.drugs.com/drug_interactions.html