Hmm, maybe a mild-medium then I'd guess.
I smoke Marlboro Red's and as a result like the full flavor cigars. A friend that smokes ultra lights will only smoke mild cigars. Just a theory but it's proven true for 2 out of 2 cases so far.
My recommendations would be something from Davidoff, Graycliff or Ashton probably. Just about everything I've had from them has been a really smooth mild - low medium experience (they do have some full strength offerings though, check descriptions). You mentioned Opus X so I assume $15 - $20 a stick is fine. If looking in the less than $10 range, I'd say Olivia Connecticut Reserve, or maybe a CAO Gold.