Stratios - you might think my favorite pirate ship is the 'Snake, seeing that I've extolled its virtues so frequently, but you'd be wrong. It's a great mission-running boat, to be sure, but does not offer the utility of a Stratios cruiser. This boat is stealthy with a covert ops cloak, well-tanked with armor resist bonuses, and a decent damage dealer with drone and laser bonuses. It also is bonused for exploration duties, for probing and hacking. This makes the Stratios the ideal ship for running Ghost Sites, which can blow up in your face if you aren't careful - in the Stratios, you can run them with an excellent chance of survival, even if all goes wrong. I keep a Stratios based in Solitude and use it for exploration in low-sec, and I've never gotten caught, though many have tried. The Stratios is simply too elusive to catch, if you keep a watchful eye on d-scan. It's a fun ship to fly.
Some EVE lore experts speculate that the Sisters of EVE faction ships have some mysterious capsuleer-tracking purpose hidden within them. This only makes them more interesting, if you ask me.
Plus, I think the Stratios is the coolest-looking ship in the game, with its sleek lines and clean white and red color scheme, and a beautiful translucent blue shimmering warp affect in its ringed aft section. I never get tired of admiring the appearance of this fine boat while in flight.
The Future of Yarr Ships
Perhaps we might see more pirate ships released in the future. There are still other factions in EVE Online lore that are not yet unlocked by cross-training. Interestingly, there are no obvious candidates for the as yet unoccupied Caldari/Minmatar intersection, though.
Two criminal factions that are begging for their own player-flyable ships are the Equilibrium of Mankind (EoM), a pirate faction spun off the Amarr, and the Intaki Syndicate, black marketeers spun out of the Gallente/Caldari conflict. We have some Intaki SKINs for some Gallente ships already in the game, as well as the Victorieux Luxury Yacht - and some EoM SKINs for Amarr vessels - but no dedicated ship designs for either faction yet.
I'd be surprised if the Intaki was not a Gallente/Caldari cross-train, if CCP ever decides to release ships for this faction - based on the lore, it's an obvious choice. As for the EoM, they'd have to be Amarr/something - probably Minmatar, I would suspect, but that is only a guess.
There are other options for cross-trained ship lines as well. The Ammatar Mandate is an obvious Minmatar/Amarr cross-trained faction. The Khanid Kingdom could be Amarr/something as well. Perhaps the Amarr may eventually lead to more pirate cross-training options than the Gallente do today.