I'm about to make a Purple Haze clone as well...I was looking into getting a 49oz (3lb) can of Raspberry Vinter's Harvest puree but I'm not sure how much to use for a 5 gal batch.
I read every single page of this thread, and am excited to get this going. I'll probably do a partial mash first before doing all-grain. I'm waiting for some others who started their extract batches to report back with their results.