NAS Recommendations

Hi all. I am looking for some recommendation for a NAS. To be used to store backups of my three home servers as I am fed up rotating LTO tapes every week and would prefer to perhaps do quarterly tape backups and nightly incremental NAS backups. I have an old Buffalo TerraStation however it is pretty terrible using it with Linux and only really works wind SMB of AFP shares reliably. I have looked at building a FreeNAS unit as I have used Freenas extensively in my previous jobs. Perhaps if anyone knows of a good dual NIC ITX board available now? Alternatively I have heard QNAP are guite good? Anyone care to weigh in with their experiences? Thanks