Well, all of the non-hybrid forms of Salvia leucantha and S. farinacea x `Indigo Spires' are standards. You might also try S. confertiflora. These will work also as dried flowers

Many of the others will hold blooms for a while, but will drop them. Betsy Clebsch recommends cutting the stems under water to keep the freshly cut vascular systems from closing up. Some sugar water might also help nearly developed flowers continue growing, thus enhancing the intensity and duration of bloom.

Thanks for the suggestions. I'll be looking into a source for plants.

I used salvia coccinea in various colors in my flower arrangements. The ones in part sun produced long strong stems. Loved them-- miss them-- can't wait for spring.

For S leucantha, try using very warm water when you cut them, and let them condition overnight. They may droop at first, but will perk up by the next day. S leucantha lasts at least 7 days. Pineapple sage also makes a fantastic cut.

You should be aware that both are daylength sensitive and won't really start blooming until the autumn equinox. You can still get 2-3 weeks of cuts in your climate; if you can grow in a high tunnel, so much the better. The flower farm where I used to work grew both - imagine a 30 x 90 high tunnel filled with these!

They are both easy to propagate vegetatively. If you keep a stock plant in a greenhouse and start taking cuttings in Feb/March, you can have lots of plants for setting out when the weather warms up.
S farinacea is easy to start from seed, or plugs are probably readily available.