docmartin
Contributor
with oxycheq you only have a choice of 30lb or 45lb. as far as halcyon i would recommend the 36lb since you plan on some cold water diving. with oxycheq it would probably be the 45lb. there is a huge thread on the oxycheq and people claim the 45lb does not have the usual drawbacks of drag and bad trim. read the thread. the people who have used it love it. unfortunately i cannot comment from my own experience. i can tell you however that i love my halcyon.