East to use database to store protein sequences

Hi,
I am currently conducting an independent research on a class of proteins. With 19000 protein sequences to be stored and classified into 5 classes based on conserved domain of each class,using bioinformatic tools. What would be the best database to be used that is easy to use and will consume lesser time for such a huge number of proteins to be worked on.

I will be linking this database with a software that would identify consensus sequences.