You will want to use the best quality seal ink you can find and/or afford. There are two main problems with cheap, poor quality ink. First, the ink is more likely to bleed when mounted/backed. Second, the oil used in cheap ink is likely to separate after being stamped on your artwork and can eventually create an oil stain around the seal impression.
Packets of good quality seal ink may cost $30 apiece or more and you may need three or more packets for use in your container. But, when you consider that this ink will last for many years, it is well worth the expense.
The illustration is a painting by Xu Gu (1824-1896). You may be able to see the oil stain around the seal in the lower right corner.