There are different kinds of warmth, and different kinds of places.
If you want a nice, dry warmth, Arizona is wonderful. There are bargains to be had if you want to buy a condo. I like Tucson, which has a laid-back image. Lots of snowbird communities there. Scottsdale, a suburb of Phoenix, is very upscale. Sedona is very New Agey.
If you like 70 degrees and oceans, then maybe San Diego. Of course, California has a huge variety of warm, sunny places to choose from.
If you're okay with humidity, then Florida may be your mecca. It has all kinds of snowbird areas, from trailer parks to high rise apartment buildings. If you want a metro area, consider Miami.