Here is my home server on a budget:
Case: Old mid tower case $0
MB: BCM RX67Q, new off ebay, $50
CPU: intel G530T, used off ebay, $50
HSF: std intel $0
RAM: Crucial, 8GB Fry's, $35
RAID cards: Highpoint RR2300, 2x $45
PSU: Seasonic SS-350ET, $35
Cages: 2x Cooler Master 4-in-3 device module, Amazon, 2x $27
Cage: Thermaltake MAX-1562, Amazon, $75
HDD 3.5in: 1x 3TB (Costco), 2x 2TB, 1x 1TB, 1x 500GB, total 8.5TB
HDD 2.5in: 3x 80GB, 1x 100GB (parity), total 240GB
SSD: 1x 64GB Samsung, $65
ODD: old DVDRW, $0
Misc: 2x Molex-4x SATA power, sound absorption rubber sheet, 2x thermal control 120mm fans, 1x Gelid 80mm TC type fan.
1. All the 3.5in HDD are in JBOD mode. The Cool Master cages are pretty cheap. Fan was replaced with thermal controlled fans.
2. There are 5x 3.5in HDDs in the box now with 5 more empty slots, 3 in the Cool Master cages and 2 more in the case.
3. 3x 80GB 2.5in HDD makes a 240GB RAID0 with 1x 100GB parity drive. The 6 slot 2.5in Thermaltake cage is a little expensive.
4. OS is in 64GB SSD.
5. Total possible 3.5in/2.5in slots are 16.
6. It is possible to replace the card reader with another 6 slot Thermaltake MAX-1562 cage.
7. The BCM RX67Q has only 5 SATA ports. It will be replaced with an 8 port intel DZ68BC in the next upgrade.
8. One of the Highpoint RocketRAID2300 4 port cards will be replaced with an 8 port RR2320 to bring total SATA ports to 20.
Here is a look inside the case. Cardboard is a cold/hot air separator. Gelid TC type outlet fan is behind the "Priority" word.
Here is what the temperature monitor looks like. The 0 RPM for AUXFan (on HDD cages) is because I unplugged it while running. CPU fan is PWM and SYSFan/AUXFan are thermal controlled.