Running static routing in addition to DHCP on my router.

Okay,
I've got a Covad T1 router coming into my house. I've got a dozen
or so available IP's available. THough I don't want to use all static
IP's to set up each computer. So I've got a linksys wireless router
(192.168.1.2 with DHCP scope of 192.168.1.150 - 199) hooked up to the
Covad. Also hooked up the the Covad is another linksys router outside
(192.168.1.1 with a DHCP scope of 192.168.100 - 149) in my shop,
serving a network there.

Both router WAN ports are serviing there own static IP's through the
Covad, that is one router is not behind the other.

I need to access both networks to access eachother.

But her's the rub. I'm implementing VOIP. I need to put Sipura analog
to digital converters at both inside and outside locations. THe
sipura's must each have a static IP. Inside is not a problem since
the Covad is readily available.

I've 1 cat5 running between the locations. I've got switches
available. I want all my workstations to be behind a router. I
realize I can replace the outside router with a switch, but then I'll
have to run it off the inside router. Can I use static routing in
conjunction with the DHCP on the wireless router. If so how?

Thanks in advance.