Ask HN: SaaS tools for building 100 person sales center?

A company that I have an investment in is building up a sales center that will shortly have 100 reps. I can't stand the idea of having premise based solutions in 2015.

Right now we use Shoretel cloud with Zoho CRM but that is combo is missing some key functions including: skills-based routing, business integration tools, dialer. I'm looking for feedback from folks who have actually set up a sales center (not just vendors) that have found good tools to help us efficiently run a sales center.

Talkdesk seems to be the closest to what I want but I've heard they sell smoke/mirrors.

Here's a good list of features I looking for: http://blog.talkdesk.com/the-most-common-call-center-software-features