Growing More Than One Species of Capsicum at the Same Time

My friend Colin and I want to grow Habaneros and Jalapeños at the same time so we have choices on any given day. Therein lies a potential problem.
If one is growing for seed (we are) then cross pollination becomes a potential problem. If one just wants fruit and will use bought seeds for each planting; then no problem, grow as many types as you like.
In my research it has been suggested a distance of 300 meters between types is the minimum to avoid cross pollination.
Our solution, since we are 16k apart, is to each choose one variety. I'll grow one variety and he'll grow the other.
In the northern climes, capsicum is an annual; but here in the tropics it's a perennial and can produce for many years.