Thanks, Arthur, that answered my question and gave several interesting new options.
I'll probably start my party off in the stock Mantis V-10C 'Solito' that you illustrated so well for Chariot, presuming they survive Chariot.
Then we'll do corporate WY vis Seegson with BioNational neutral, and they can go back to their Seegson contact at Novgorad station.
(I've got a subplot around a missing/stolen Long Lance AST missile with 'hot shot' nuclear Captor 9 BPXL X-ray bomb pumped space mine and Zubrin sustainer motor(Nuclear Salt Water,200G))
Once they are into the underground experimental arms market I'll run DoW and then transition into CM campaign, with the party getting an opportunity to fly a 'stock' CM recon Alpha One with tachyon shunt/displacement drive, FTL12-15, based on the numbers you gave from Class G's. Then once they are in the colonial marines proper as special advisors on Tamb'itam, they can get access to the real high end special forces one with grav drive, say FTL5. Given what you said, I'm picturing it as a real hangar queen, spending more time in maintenance than out on missions, but it is the fastest hunk of junk they ever see, until they steal General Vaughn's 'Black Bart' (Mantis FTL 3)