The static IP addresses should be assigned from the IP's that are excluded from the DHCP range. For instance, if your network is on the the 10.1.3.0/24 subnet, and the DHCP range is 10.1.3.100 - 10.1.3.199, the static IP's *should* all be from the address ranges 1-99 and/or 200-254.
Reservations are not for static IP's, but are to guarantee that devices which use DHCP always get a particular IP address (it is "reserved" for the device with the MAC address associated with that reservation). Accomplishes a similar goal as Static IP's, but preserves the flexibility that DHCP affords.
Try out this free utility to map out the IP's on your network:
SoftPerfect Network Scanner: fast and free network scanner
I maintain a spreadsheet of our IP ranges (I have 15 Class C subnets to keep up with), which is critical on our network where almost all devices have static IP's.