[chosen1x]

This is the answer that should top the list.

Instead of talking to the individual companies doing this practice directly engage a Value Added Reseller (VAR) large enough to work with most of the people on your list. Their (VAR) scale will let you get list price or typically some degree better and they can assist with the comparisons to pick the product and partner that fits your company needs. Keep in mind that there is essentially zero chance that you are the first person to ask many of the questions that you want answers to and a VAR is in a position to service you no matter which product you choose. All of this should help align you to the right fit.

Best of luck.