If your looking at breathing monitors, I have this and it is IMO the best invention ever. Easy to travel with you, and works great.
http://www.amazon.com/Snuza-Halo-Bab.../dp/B002ITOC7S
As For SIDS, this is the best theory I have ever seen on SIDS...at least some science behind it:
http://www.cotlife2000.com/