My favorites over the last year have been Lemon Skunk from Greenhouse. This was so lemony in every way...smelled like lemons, tasted like lemons, and the smoke smelled like lemons. Did I mention the lemony goodness? Second favorite was White Widow from Dinafem, it was a freebie seed from Attitude. The Dinafem pheno sounds very different from your Nirvana WW, it was STINKY! The Dinafem description was "strong body odor" and they were right...it stinks even in veg, but it had a ton of side branching similar to the picture of your WW and a really nice yield of dense, stank buds that were so strong I couldn't talk to her until late at night. Third goes to Pineapple Express from G13, also from Attitude. Great yield, like the WW, fruity as hell, and a great stone. I did two batches, one totally organic and one with a mixture of organic and chem ferts...all advanced nutrients products grown in Foxfarm Ocean Forest soil for everything above. I went through about 15 strains from various breeders, but liked these the best. Check any of these out, you won't be sorry.