http://usakoi.com/bio-chip-25-liter.html is this your bio chip??
That Stoney Creek stuff is actually more money then K1. One could argue it has more surface area, but without some sort of media similar to Kaldness's chips I would still go with Kaldness without a doubt..
Ultima 2 media? Is that not for a bead filter? Not sure why it should be used in something like a reactor if it's designed to be used in a filter that's backflushed regularly.
The bio chips are an important part of the equasion that always seem to get overlooked. Here's some info from Aquatic Eco on them.....
The Biochip is much more than just a different shaped media. In addition to having a total protected surface area more than 2.4 times that of Kaldnes® K1, the protected area in Biochip is a great environment for micro animals, not just bacteria. Micro animals feed on small particles such as fish waste, dead bacteria and algae. There are many different types of these micro animals, and they produce high levels of filtration. For example, Vortecilia filter 10,000 times their own volume per hour and feed on particles up to 5 microns in size. A hydrophilic layer in the Biochip creates extremely quiet zones in which micro animals can flourish, whereas other types of media would flush them out. Add to existing K1 moving bed at a ratio of 1 part Biochip to 4 parts K1.
I buy from Aquatic Eco. I have yet to stump people with questions there. They're supposed to pricematch, and there's way cooler stuff in that book then any other supply house I've seen......