for your budget, i would suggest you get a good sony or a pio HU with preferably 2 or 3 pre outs & initially install front components. (I dont really know which is the best). probably hertz, jbl, infinty etc. and a 4 ch amp which will at present only drive your comps, but could be made use of later to drive your sub also.
HU - 12,000
Comps - 6000
4 ch amp - 5000
thats 23k. see your budget is already expanded now.
