I have finished DT top 100 several times by playing ELO, not bad if you can earn some extra clintz.
My personal tip: start playing ELO later in the week, say weekend, and you could meet many weak decks because of their low scores. Hence you can get higher winning ratio than in DT rooms. Though I have not run that for months, I am sure it still works.
Why not play a DT in ELO? keeps you from having to face people using OP cards while increasing you ELO score. I often forget to change my deck between DM,DT,and ELO games that i jut keep my ELO deck and when I actually pay attention due to the lack of yawning..I can actually win a good # of DM's and place fairly high in the DT. Suppose it is what you want to do...I dont have any of the massively rare cards so I choose ELO style where banned cards help me out
If you are heading for top ten or better, ELO is a no go, simply because people take their time in elo, which is a serious obstacle to a DT player. If you can´t play twenty matches in an hour you will not get top ten. If you can play more you have a bigger chance of reaching high.