I don't think it needs repotting at the present time. It will eventually, of course, but the roots don't appear to be terribly overcrowded. I think I would wait awhile, if it were mine.
Why not leave it in its old pot for now, and take another peak at the roots in about a month or 6 weeks, unless it begins to show signs of stress, such as wilting?
It bothers me that it's in a pot without drainage holes, though. It looks quite healthy, but you're really risking root rot by not providing adequate drainage. Typically, what I've seen happen with such plants is that, as the roots fill the container, they become less able to absorb water, causing the plant to wilt soon after it has been watered. Many times, that leads the owner to think they need to water the plant more frequently. Without adequate drainage, the roots simply begin to rot.
If you want to repot it at this time, why not just choose a pot the same size or just a tad larger than the old one, but select one with good drainage?