Disclosure: Business VoIP Broker
We sell Jive (as well as 100+ of their major competitors), and with 100 stations and only 30 call paths, I probably wouldn't recommend Jive.
Jive (like RC and many others), charges $20+/user and includes a call path with every user. This is obviously overkill for your company.
Instead, I'd suggest looking at providers who cater to larger companies, and therefore, price call paths separately than users. For instance, several of these providers are approx. $5-$10/user and $20/call path. That pricing would probably reduce your company's cost by more than 25%.
These providers also have feature/functionality that better-caters to larger companies, such as the ability to create user templates, hybrid capabilities (allowing you to install 1 site at a time, yet still have all phone systems integrated, etc.).
I'm happy to give you some recommendations but just need more information on your company's requirements, since each provider has their own niche.