Finding the Right Business Phone System?

KodaK asks: "I've recently been hired by a small-but-growing financial firm to be their systems administrator (Non ex transverso sed deorsum), now they want me to evaluate and recommend telephone systems. They want call reporting, and they also want visual call management. I've looked at Asterisk, and while I'd love to play with a system like that, I'm not skilled enough to put together what they want out of it in the timeframe they need, so I've been looking at PBX systems like the Alcatel OmniPCX Enterprise and Artisoft Televantage. However, I don't know enough about phone systems to effectively evaluate them. What should I be looking for? Are there really any differences, or are they all pretty much the same? The Artisoft is Windows 2000 based and that scares me from an availability standpoint (hey, VXWorks is /designed/ to be 5 nines, you can't say that about Windows). The Alcatel is Linux at the core, but is that really meaningful when there's other systems out there designed from the ground up to be telephone systems? Any suggestions? Any warnings? I'd appreciate any information or advice you can give me on any phone systems, not just the Alcatel and Artisoft. I want to make sure I'm making the right recommendation when there's a $30k plus investment involved."