I like the LFR- naming system too. If you want to keep it one letter, how about O, for Omnidirectional? Also, jumping over the 100 to 200 is a good idea, as the VP series reside in the 100s. But will there be smaller LFRs in the future? So maybe LFR290 (since it is larger than the M80)?

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris