If anyone wants to know mechs available based on timeline I suggest going to the
Master Unit List. You can also sort out what is and is not available by comparing it with
Sarna.
Here's all available lights based on timeline and availability that aren't in the game (unseen excluded, * using debatable data).
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20 Tons
Mercury (MCY-97, MCY-98 & MCY-99)
Thorn (THE-F, THE-N, THE-S & THE-T)
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25 Tons
Mongoose (MON-66, MON-67, MON-68 & MON-69)
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30 Tons
Firefly (FFL-4A, FFL-4B & FFL-4C)
Hermes (HER-1A, HER-1B, HER-1S, HER-3S, HER-3S1 & HER-3S2)
Hussar (HSR-200-D, HSR-300-D & HSR-350-D)
Javelin (JVN-10F, JVN-10N & JVN-10P)
Urbanmech (UM-R50, UM-R60, UM-R60L & UM-R63)
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35 Tons
Firestarter (FS9-A, FS9-H, FS9-K, FS9-M, FS9-S & FS9-S1)
Wolfhound (WLF-1, WLF-1A & WLF-1B)
As seen above the largest pools above to choose from at the 20 and 30 tonners which is why I personally gravitate towards the Javelin and Hermes. Anything outside of the ones above either aren't available yet, don't have enough variants or the units we're introduced via TRO's for 3070 or later or Clan TROs.
If you wan't a similar breakdown above it will be in the Ultimate Mech Discussion Thread.
Edit: After writing for an hour nearly finishing the forums decided to wipe my progress. So I will not be updating and releasing a possible list of mechs for the different weight classes in the Ultimate Mech Discussion Thread.
2nd Edit: Removed the Flea due it already being announced for MWO.
Edited by Butane9000, 02 February 2014 - 08:55 AM.