Within a budget of 12k, I would buy a 4K HU, 5k Front speakers (Components preferably) and 3k Rear speakers (6X9" Co-axials).
My choice would be:
4k HU: Pioneer 4950.
5K Front speakers: JBL GTO 507
3K Rear speakers: JBL GTO 937 (grey) or JBL CS 3196 (B&W).
We are known to always stretch the given budgets and always cross it. Yes, this should've crossed too.
