External storage suggestions

Dear all,

my chassi is full, no more drive bays nor SATA ports, so I have to expand my storage.

I wonder if someone could advice me how to expand my storage.

What technology should I use? (eSATA)

What controller card?   It's a requirement to obtain SMART data to StableBit Scanner.

External closure? (4 - 8 bays)

My motherboard has 2 free PCI Express x16 and 1 PCI Express x4.

Thanks in advance,

Per