I really enjoyed my PeakseedsBC Kush x Blueberry. Smelled like Kush and Blueberries at the exact same time. Potent, easy to grow, nice stone if you like mellower buzzes. Good vigor. Still kind of amazed by how it smelled, unfortunately it was lost with some other clones when I got ill. But I only had one plant and it was quite good.
I've heard others say they ran the Kush x Skunk (which I have seeds of and am tempted to run) and it was some of the most potent they've ever had. His Sweet Skunk is extremely strong smoke. I'm pretty interested in this cross.
Structurally his Kush Blueberry was awesome. His Skunk x Kush might be even better. His Sweet Skunk was clearly bred to be used in hybrids as well as being strong. It has good branching, internodes are spaced quite large - but the Kush is the opposite. It would be a great plant structurally I'd bet.