Thanks to everyone who advised on submersibles. I seem to have narrowed the choice to either the upgraded (at least on Trusty's site) 199 or the 243. The 199 appears to have a more orangy lume (which I like) than the 243. On the other hand, the 243 has the 'reg T.M.' on the CG, which I also like--but doesn't have the more colourful lume. What are the differences other than this, between the two, and are the numbers of the 199 indeed more orange than the 243 or is that simply the photo? Any recommendations? between the two?