I have a 998c hd/si on my console and recently purchased a 898c si for my bow but have the opportunity to purchase a 899c hd/si at a good price. Which unit IYHO would be the best choice to link with the 998. What's my best option ? I purchased the cable to link the 898c to the 998 but would I need more or something different with the 899c ? Help and thanks ...