For my reference, and yours if you wish to build something similar:

ESXi Server

• Gigabyte GA-990FXA-UD3 Motherboard – Supports IOMMU (DirectPath I/O)
• AMD FX-8120, 8-core, 16MB cache, 3.1GHz CPU
• Mushkin Silverline 32GB (4x8GB) DDR3-1600 RAM
• Corsair Builder Series CX500 500W Power Supply
• Antec 1080AMG File Server Case
• 2x Intel PRO/1000 GT NICs

FreeNAS Server

• Asus M4A785-M Motherboard
• AMD Phenom II X4 945, 4-core, 8MB cache, 3.0GHz CPU
• Corsair Dominator 8GB (4x2GB) DDR2-1066 RAM
• Antec High Current Gamer 620W Modular Power Supply
• Antec Six Hundred Gaming Case
• 3x 2TB Western Digital Green 64MB cache Hard Drives
• 3x 2TB Western Digital Red 64MB cache Hard Drives
• 1x 750GB Western Digital Green 64MB cache Hard Drive
• 1x 16GB Kingston DataTraveler 111 USB Drive (FreeNas install)
• 1x Intel PRO/1000 GT NIC

XBMC HTPC

• ZOTAC IONITX-F-E Intel Atom 330 Motherboard/CPU
• Kingston ValueRam 2GB (2x1GB) DDR2-800 RAM
• Apex MI-008 Mini ITX Case
• 250W Power Supply (Included in case)
• Hauppauge HVR-2250 Dual TV Tuner Media Kit
• Western Digital Blue 250GB Hard Drive (2.5″)
• XBOX 360 Wireless Controller Adapter
• Moneual Lab MK700 Wireless Keyboard with Track-Ball

Main Rig

• Asus P8P67-M Motherboard
• Intel Core i5 2500K CPU
• Corsair Vengeance 8GB (2x4GB) DDR3-1600 RAM
• OCZ ModXStream Pro 700W Modular Power Supply
• Antec Three Hundred Gaming Case
• Intel X25-M 80GB SSD
• Seagate 7200.11 500GB Hard Drive
• Logitech G15 Gaming Keyboard
• ThermalTake Black Gaming Mouse