I think thats a good idea...their seeds are cheap , so to buy a bag to grow with a more expensive type won't cost too much extra...and if the Nirvana type holds its own...then you can save a lot of bread in the future by buying their seeds instead of paying 'an arm and a leg!'
But what im after is someone who has done this ALREADY.......coz for me to find out may take 3 months! ya know