Skunk #1 "The Pure".
It's a classic, hardy, fast, IBL. Make the seeds on your first run- shoudl give you PLENTY!!!! Don't forget to refresh your seed stock every 3-5 years.

Another thing to look into is a locally acclimated line. The Alaskan hippie weed descended from MTF is like that, and I know of at least a couple local strains in my area nicknamed "VT Green Lifesaver" and "Hilltown Humbleweed" that give good, consistent yields year in and year out. I don't know where you are, but if you get into the growers' circles you may eventually get your hands on something like those. You'll almost never find them for sale through vendors, though.

The exceptiopn that I can think of offhand is a strain called Island Sweet Skunk, ISS, or Sweet Island Skunk- Federation Seeds offers it- it's a Vancouver BC line that is truly stabilized.

Pure Afghans are another place to look if you want to keep on wiht seed runs indoors.

Always choose your male for excellent structure and vigor. Kill all but the BEST male, and save seeds only off the BEST seeded female based on finish, time to finish, yield, and smoke test. After a few generations what you started with will be drifting noticeably towards better suitability for your own specific growing conditions.