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Preamps figure if you go lightpipe (Octapre, my choice, or digimax, etc) you'll spend about $1400 with cabling if you want to monitor analog.

Mics can run anywhere from $700(a beta 52 or D112, a couple oktavia condensors and a few 57's) to tens of thousands.

cables, about $20 each.
Stands, if you use low budget ones, $250.

So figure $2400 with some buffer. don't forget you need a snake to get them mics from the drum room to your control room, and headphones for the drummer to monitor with.

Hope this is helpful.