I just filled out the order forms for 5 new trucks last week. If the 7.3 was still offered, then I would have ordered all as F-550s with that engine. To this day, the 7.3 Power Stroke has been the most reliable and profitable engine that we have ever had in a fleet truck....by a fair margin too.
However, since the 7.3 is no longer an option, I went with 3 Kenworths (T170) and the other two trucks will be F-550 with the V10 engine. The 3 Kenworth trucks are going to replace International 4900 units and the F-550 V10 units are going to replace F-550 6.0 models.