It's a PITA, messy job. When mine went (a 15F day), it was about $500. Mostly labor to clean everything. Intake has to come off. Only part the Indy replaced at that price was the actual CCV. I later replaced every other part of the system myself and then put the heated wrap gizmo.

I guess I should add that I did not loose anything that looked like coolant. Definitely worries me a little that one of your head gaskets let go.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles