I still stand by the external crossover if you can fit it into the budget. 

One of the benefits for this job is that with the big Control 29s I ended up with a crossover point that sounded best around 70hz.  The lowest crossover point in the CDi DSP I think was 90hz so the external crossover let me select a better sounding setting and was more flexible.

Crown has an iPad app for some of the newer amps, but I don't think it works with the CDi models that only have a USB port (no Ethernet).