Hello to all fireHeads!!

I've been growing chilePeppers for several years now, and find myself on the horns of a dilemma. The dilemma is this.......do I continue to grow my various pepper types close together, producing an unpredictable (yet interesting and unique) heat and flavor pattern........or do I attempt to separate them in an attempt to keep their individual characteristics more "pure". Before I decide what to do in this situation, I need some information from you guys. What would be a reasonably safe distance to separate the different chile varieties to avoid cross-pollination? Please keep in mind that I'm a home gardener.......ideally I should probably plant them miles apart, but that's not an option. Any "at least that far" suggestions?

Thanks for your responses......