I am in zone 7, so I cannot really identify, but I can think of some beautiful plants, many of which will, eventually, get too large. Would hardy oranges or pomegranates survive? Osmanthus fragrans may bloom where you live in every month with an r in it. Camellias? I have a dwarf Corylopsis offered by Camellia Forest called 'March Jewel'. At Winterthur they had Acer palmatum 'Sango Kaku' in large pots on the patio. Is it too warm for Hamamelis?
Go on the website for woodlandersnursery.com (I think) as they are in a similar zone and list numerous wonderful plants. The same plants are often listed by Forest Farm on the West coast.

In zone 9, pretty much any plant that is perennial (lives longer than a single season) can be grown in a container throughout the winter without worry, as it is considered a nearly frost-free zone. I have dozens of permanent container plantings, including trees, shrubs, dwarf conifers, perennials and vines, that have overwintered for years with no particular attention or protection. Bamboo is an excellent container plant - perhaps better in a container than in the ground :-))

Just an aside, but there are very few locations in Oregon that are considered a zone 9 - the south coast area around Brookings is the only one that comes to mind. Are you sure about your zone listing, as that may influence exactly what you can grow.

The southern Oregon coastal Banana belt is Gold Beach to Brookings (see map in Sunset WESTERN GARDEN BOOK). There used to be a Phoenix palm near the highway as you entered Gold Beach from the north, announcing that a mild climate area was being entered - maybe the palm is still there.

Brookings doesn't even look like Oregon. When I went there I saw, queen palms, date palms, fan and windmill palms, citrus, agave, and cactus. It was beautiful.