Ugh, I will never understand what anyone sees in amanitas. I guess everyone's affected differently, and the content does vary between mushrooms, but I tried it once to disasterous results. It was nice for a short amount of time, until I started vomiting like my stomach was trying to escape the rest of my body. I was curious if that was just a bad batch, so I was going to try it a second time, but I guess my body's memory of the experience made it impossible for me to go for round 2 - the second I tried to swallow a bit of a cap, I had an uncontrollable urge to vomit. ::shivers:: Awful stuff.
HBWR seeds, however, are very cool - I enjoyed that one. If you really must, I'd try amanitas by themselves first to see how your body takes to them. It seems silly to try them both together if you haven't had amanitas alone - if you don't take well to them, then you'll just wind up wasting your HBWR seeds as you launch them into the toilet.