I read earlier of a dealer who stopped selling the single Integre becase customer would always opt for the Complete he also sold.
Just beware that that they won't give a 4 ohm rating for the Complete; just the 50 watts at 8 ohms. The Integre is 50w @ 8 ohms and 90w at 4 ohms. So the Complete may not be as good with hard to drive speakers.
If you can afford it, the DT Integre is worth it, if you like the YBA sound. The phono stage with the Integre is first rate. As a side note, at one time YBA use to let you upgrade a single Integre to a DT, but I don't know if they still do.