Flynn always says it's us Movers that know the most about the ships we fly, but some of the younger ones barely get out of the cockpit to take a look. However, I'd be happy to share my thoughts.
Our Celestras are pretty small, but they're damn zippy and look pretty fine too. You can normally fit 1200 units in their hold, minus any extra plating or electronics from its 6 turrets. Xi de Mortis, our Minister of <strike>Pizza</strike> Science and Technology seems pretty fond of it.
Most of us use the Atlas though, including yours truly. It might not be the prettiest thing, and you're a big target, but it comes with enough space for 4000 of whatever you've adapted it to haul around. The Bewildered Scout has some benches and heaters to carry Refugees, Scientists and whatnot; but that doesn't stop me from filling it up with Munitions on the next run.
If you're still interested, let us know who you are and who you'd be working for with your transport, and we'll see about the funds.