heres a cheap intel Mobo that supports ECC memory
But requires an Xeon processor E3 family.. but its $184.99
Intel Server Board S1200BTS at Memory Express
Newegg.ca has it for $179.00.
this board supports the core i3...
the socket type is an LGA1155, so not sure if the core i5 works, but intel website lists the i3..
Intel® Server Board S1200BTS
just go to "Compatible Products" then "Processor"