Personally I like to keep primary fermentation temps at 56°F. Wyeast's 1007 German Ale Yeast works great at this temp, and produces a damn fine kolsch. I ferment at 56° for 3 weeks, then cold crash to 35° for a month or so, all in the primary, I do not use a brite tank. I have no problem bottle conditioning my beers, if you're worried about lack of yeast in suspension, just stick the racking cane into the yeast bed while siphoning to the bottling bucket, you just need to suck up a small cloud, and the yeast will have no problem carbing up your bottles.