As you look at interchangeable needles consider what you will be knitting. Many sets do not have needle US sizes 2 or 3 and only go as low as 4 or 5. If you knit on the smaller needles this might be a consideration.
I am not aware of any interchangeable set that has a US size 1 needle of smaller. The connection between needle and cable on size 1 and below would be very fragile.
Hear Hooves think horses.