Financial and resource planning software for £150m t/o Council

Cityworks, the Council's DSO, needs to replace its IT systems with something to plan, monitor and control our contracting activities like building, highway maintenance, etc.
We've found one suite of software, Mentor Enterprise from Ramesys, but I'd really like to find something to test against this. The few potential contenders I've found seem to shy away from either the size of our operation (5,700 employees, £150m) or from the fact that we're talking to Ramesys.
If anyone could point me in the direction of another product, or share their experience of Mentor, I'd be grateful.
Neil Eglintine