I find MOST themes and even most theme sites all pretty much consist of run-of-the-mill fly-by-night themes that never EVER update. With my limited knowledge of any back-end things server wise this means each time Wordpress comes out with a new version I am having to find a new theme... this sucks cuz I really like some of those themes.

Are there good places to get reliable themes that actually update the ones they have rather then needing on changing themes each time I'm prompted to update?

On one of my blogs I've simply tweaked out the header to include an image rather then just changing it's color, and then tweaking out a few preferences to make it less then default...but it's still pretty 'default'. Is this enough of a change to constitute it being 'custom' or is a new 'unique' theme still needed?

How do all of you cope with such matters?