I've found a mega yielding awesome quality sativa dominant black widow a couple times. It took me about 40 plants to find these two. But it yields like a beast. Big, dense buds all up and down, frosty with a real almost skunk undertone nose - most of the specimens don't compare really but this one is great. I've seen it cause psychotic breaks in people. It's pretty strong. Some hate it. Some love it. Yields for days though.
NLxHaze from MNS yields a lot too. I've also found some very high yielding Sugar Punch phenos.
You need to hunt for the Sugar Punch a bit but not that much (run 5 plants you'll probably find one that's great smoke and yield, 10 and you're certain IMO). All the NLxHaze yielded a tonne for me, but the quality isn't consistently there you need to hunt for the quality.
Killing Fields yields a lot too. More clear headed buzz but still strong plants to be found. More hunting than Sugar Punch required (at least in the F3 regs anyway).