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IP PBX v Trad PBX - 70 extensions single site

I'm after your thoughts on IP PBX such as Zerabox (built on Asterisk) v trad PBX's such as Avaya, Nortel etc.
We are a single site, 70 extensions, with no complex routing, we want VOIP calls for Least Cost Routing, mulitple conference calling, Outlook integration, Follow Me extensions , Voicemail etc - all the usual for a Small-Medium sized Business.
We are located in Gibraltar and the board has a lean towards local telecoms supplier with a trad PBX but I think this is not the best option, my preference is towards IP PBX's which I believe to be more scalable and less propietary than trad PBX's with all their costs and expensive licenses.
Thank you in advance.
1 Solution
most end users do not immediately see the benefits of ip pbx over traditional ones.  usually ip pbx (in particular those based on asterisk) provides more advanced pbx features and offers higher scalability when comparing cost-wise.  you will probably change to ip phones as well and therefore save construction costs of telephone ports.  there are numerous compatible ip phones and you are also not locked up to a particular vendor.  

the end-user will experience more convenience than just voice communication.

in addition, the voip technology enables us to easily link up multiple sites to make toll-free calls and unified extension plan among distributed offices.  

In many circumstances, IT dept could manage the pbx themselves.  for instance, we can customize our IVR company directory.  these features are usually chargeable by trad pbx vendor.

there are though some arguments over the use of ip pbx.  one example is data security.  it looks more technically feasible for us to hijack a g711 packet rather than eavesdrop the unfamiliar circuit switch telephone network.  in fact, LAN segmentation and encryption could effectively address this issue.  

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