Currently signed up with a CM3 with a 50LY jump range. However, i've got a CM4 with a 45LY range which i'm also considering.
However, lots of time left yet and i might just break and go for something with an insane jump range or something completely different.
I don't want to be just another Anaconda/Asp/DBX though.
I suppose the main factor will be whether Fleet Carriers will be able to come along and what services they offer as that might massively change what we need to take. I mean, my CM3 only has 1 SRV, so if that is lost, then bye bye SRV for the rest of the expedition. If I know there will be a Fleet Carrier where i can restock my SRVs within a few hundred or thousand LYs though, no problemo. Of course, FD could always make SRVs like SLFs and allow us to make more, or perhaps add a synthesis type option to craft more.
However, for the moment, this is my main explorer (name is actually Wish You Were Here):
You know you want to bring your FGS.
PS - Dang you have a LOT of Cobras lol.