Hello jrmeridian,
You need;
at least 1 digital line card $800
5 digital line licence (but you have to buy at least 8)$500
5 M3905 (or you can buy M3903 is cheaper) 5*400=$2000
5 ACD agent licence 1000 $
Total cost minimum $4000
This cost for Basic ACD system(L1:Business Services Software). If you want ACD reporting you need L2:Enhanced Business Services, if you want online monitoring(real time reporting), skill base routing, report creation etc. you need L3:Advanced Call Center software and Contact Center Servers. Each of one gives you more costs.
good luck.
aasatekin