re 104's: mate of mine had some before me (he introduced me to the L's) and he didn't see his for a good 3 months once he put them in his tank. Mine were all over the place in the 2nd day of being in my tank and it's been like that since.
I actually posted something similar on another forum. I questioned their shy behaviour because the lot i have seem to be overly adventurous and not shy at all. I may have purchased the Hiltons of 104s perhaps.
just depends what you like.. people spend a fair bit just to get that rare species. I saw some L316's for sale and the price was like IMO for the price advertised i would prefer to pay for something with a nicer pattern e.g. any of the L numbers Mike listed..
With any of the smaller L's, I guess the only thing you need to remember is to make sure you have a torch handy..