Bear in mind that I've had some this stuff for a long while, so the pricing is out of date:
ProAc Studio 2 pair with stands, used, with cables
Energy 150 subwoofer, new
$750 for the set (which was a killer deal, even way back when!)
Parasound PLD-2000 preamp, open box from Audio Advisors $650
Hafler DH-220 (used), Theta Chroma DAC (new) $400 for both
SqueezeBox Touch $265 new (Amazon sale)
Teradak Analog power supply for the SB Touch, $130
Home Headroom amp, new, $600
Sennheiser HD600, new, $600 plus or minus, plus some replacement parts since new (pads and cable)
I have a few hundred in cables, also, and $200 in storage for my FLAC rips.
There have been other bits in and out of the system over the years, but that's what it looks like now.
So, a bit under $5K in its current configuration. I'm very happy with the way it sounds. Cost to buy equivalent today? Not a clue.