I try to use the following process (when time and memory don't fail me):
1. The night before brew day (maybe a day or so sooner, depending on when I got the starter going), move the covered starter to a fridge to chill and drop the yeast.
2. Move it to my ferm chamber the morning of brewday while I am getting my gear out.
3. Once the mash is going, I decant all but about the last 1/4-inch of starter beer (or all of it if I had chilled enough to let the yeast form a nice, compact cake)
4. Add about 200-250 ml of fresh starter wort. I can my starters ahead of time in quart and pint mason jars. I usually do 10 gallon batches and often pitch 2 different yeast (1 in each 5-gal batch). That means I make 2 starters. Each starter gets half of a pint jar of fresh starter on the morning of brew day.
the starters go back into my fermentation fridge to acclimate to whatever temp I am fermenting that particular beer and to allow the small amount of starter to "wake them back up".
Since 200ml is negligible in the grand scheme of things, I usually toss that new starter in with the yeast when I pitch.