HP DL360P Gen8 ~$4700
2x Xeon E5-2640 Six Core
16GB RAM installed
(can be downsized to single proc for a cost of $2600, can still add the second if it become necessary)
6x HP 600GB SFF 10K HDD(RAID 10 for SQL storage, adjust capacity as necessary for your config) This will give you about 1.8TB usable storage
2x HP 146GB 15K SAS for OS
EDIT: The DL380p Gen 8 could be used to add some additional drive bays, the 360p only has 8 while you can add a second 8 bay module to the 380p for a total of 16 bays.