I really didn't see what you were trying to gain by switching to IP telephony. Most of the features you mentioned can be accomplished using traditional PBX's. The big issue to implement some of these features would be security. Just about any standard voice mail system will give you auto attendant capabilities. You can add equipment to your existing PBX's to convert voice traffic to IP and send it across your network. I highly recommend this approach because you can still fall back to traditional voice circuits if your ip network fails. It is also a better way to make sure your IP network can handle the additional traffic. New IP phones are expensive and the trade in value for most PBX phones is less than 20% of the original purchase price. Unless you have a pressing need for features that only VoIP to the desktop can deliver, you would be better off with VoIP from PBX to PBX.
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I really didn't see what you were trying to gain by switching to IP telephony. Most of the features you mentioned can be accomplished using traditional PBX's. The big issue to implement some of these features would be security. Just about any standard voice mail system will give you auto attendant capabilities. You can add equipment to your existing PBX's to convert voice traffic to IP and send it across your network. I highly recommend this approach because you can still fall back to traditional voice circuits if your ip network fails. It is also a better way to make sure your IP network can handle the additional traffic. New IP phones are expensive and the trade in value for most PBX phones is less than 20% of the original purchase price. Unless you have a pressing need for features that only VoIP to the desktop can deliver, you would be better off with VoIP from PBX to PBX.