I also use the Patak Biryani paste. The whole family loves it.
My favorite is lamb biryani, and I always add lentils (because that's how it came in South Africa), preferably the tiny black Beluga lentils. It makes a good vegetarian dish with lots of lentils. Once on a plane, I told the Indian woman sitting next to me how much I used to enjoy South African canned breyani (SA name). I thought she would pass out from horror, so I quickly told her that I made my own, nowadays. She was so relieved that she didn't even frown on my using a jarred paste. smileys/smile.gif I prefer the paste - I can get spice mixes from the Indian store nearby, but the whole spices seem to stick in my teeth, for some reason.
The Maya Kaimal sauces are excellent, but I haven't used them for biryani.