I agree with Shardone - it depends on what kind of sound you want, your other equipment, and your room. Try the stock Benchmark on trial first. If you like neutral and it works with your setup, then you will be very happy with it. If you want more dynamics, a more liquid midrange, and deep, tight, and articulate bass, then the Cullen Mod DL3 is a stud. You will be very satisfied either way you choose.
For the record, I own the DL3 with the level 3 mod (my source already had a phase corrected coax, which is the difference between level 3 & 4 mods).
For the record, I own the DL3 with the level 3 mod (my source already had a phase corrected coax, which is the difference between level 3 & 4 mods).