Apart from the web service, what other features are you looking for? No doubt we've got a number of 780 users here, they can be your best source of information.
If it were me, I'd lean toward Scan Control - that software is just about ready to introduce an intelligent audio record function, imports CSV files completely (some software - not sure if this is true of ARC780 - only imports freqs from a CSV file), and if you have more than one Uniden model, you can share your files (within some limits) with your other scanners. And while it's true not every agency has a CSV file available here, many do...
Our Wiki has most of the software that supports the 780 - I don't know if ProScan supports the web service, but if it doesn't - well, if enough people ask for it....
http://wiki.radioreference.com/index.php/BC780XLT
73s Mike
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