Windows to Mac DHCP Migration Issues

We are migrating our DHCP and DNS services from a Windows server to an XServe. We have started the process and noticed that Server Admin does not provide a place in the DHCP service to put in a range of IP addresses to be excluded from being handed out. It only lets you do it on a individual computer basis. The problem is that we have over a hundred devices on our network with static IPs right in the middle of the IP range set for DHCP. (I inherited this design) Eg:
Complete DHCP Range: 192.168.180.1 - 192.168.181.254
Static IP Ranges: 192.168.181.1 - 192.168.181.100, 192.168.181.200-229, 250-254 etc
The DHCP service on our Windows DC has a place to put in multiple ranges that can be excluded from DHCP so it is easy to define the complete range of our network and exclude ranges used for static IPs. I just don't see how to do this in OS 10.6. If it is not there on purpose then what is the logic behind this?
The other issue we are having with DHCP is that the DORA exchange for client computers is taking almost 2 minutes to complete. Is this normal for DHCP in OS 10.6? I can take the same client laptop, pull out the ethernet cable and plug it into the existing Windows network and get an IP address in 45 seconds. We did this test with multiple new computers and they all took the same amount of time. There are no errors in the DHCP log.
Any perspective for either issue would be greatly appreciated.

this may not be directly helpful, but i have two related questions.
if you've inherited these ranges, is there anything particular preventing you from changing them to make your life easier?
if you're swapping these services to os x server, why, and would this be a good opportunity to change the ranges?
in any of my clients' networks 45 seconds to get an address would be atypically long. there must be something else going on to cause such delays.
what's the impetus to move dhcp and dns away from windows servers, especially if the services are working well enough?
i wouldn't necessarily recommend using os x server just for these services. any linux distro with dhcpd and bind will do just fine and probably be a better investment.

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