Hi
The noraml way to do this is to create a second VLAN for the 192.168.1.x address range. You then put all teh ports connecting to your PCs with 192.168.1.x addresses in this new VLAN. At this point they will not be able to talk to the PCs on the 192.168.0.x address range.
On one of your L3 switches create two SVIs one for each VLAN and assign an ip address from each addres srange tpo the SVIs for example
int vlan 1
ip address 192.168.0.254 255.255.255.0
int vlan 2
ip address 192.158.1.254.255.255.255.0
If you now set the default gateway of your PCs to be either 192.168.0.254 or 192.168.1.154 dependant on if they are on VLAN 1 or VLAN 2 the L3 switch will route their traffic between teh two IP address ramges and they will be able to talk to each other.
I would also look at HSRP if I were you which will give you defualt gateway redundacny should the L3 switch acting as a router fail in some way.
Regards
Pat