best single drive thunderbolt 1 with 2 ports...

Hi-

I've been editing some long form and long term documentary projects on my 2011 mini server connected to a Pegasus R4 (the original Thunderbolt 1 version.) I've got some new projects coming up and I need to side load some projects off the R4 to other external storage.

I've seen many thunderbolt 1 drives with 1 port but I have my second monitor plugged into the pegasus via displayport cable. I'd like attach 2 more, fast, single drive disks (most likely SSD) and was wondering if anyone had suggestions on a case or drive that fits the bill- namely 2 thunderbolt 1 ports for daisy chaining.

Suggestions?!