Glad you like the suggestions. I'm well aware that some of my suggestions turn out to be stinkers so salt as needed.
I like spinally mounted guns, and i like integrated weapons. What if the buffalo 2(3?) had a spinal integrated weapon? That might be amazing.
(prepost edit: yay mark 3)
Off topic story time!
Spoiler
I like the buffalo2. Its not a good ship, but once you have 3 ranks in the +%flux capacity skill you can slap on a shield. So right out of the gate if you choose something else both times. The buffalo2 is decent if you've invested in the missile skill. Its never what i use if i want to beat tough enemies, but its cheap and prolific so i don't feel bad about losing one(just be sure to use sealed doors to reduce crew loss). Its also got an ok base speed so i can avoid the tougher fights.
Sometimes for funsies i use whole fleets of buffalo2s to kill things. The most impressive one to date was the pirate carrier fleet with the venture in it. I suffered heavy loses, but those 2 levels were sure nice.
The mule is on the cusp of being a decent combat ship. With its medium omni and maneuvering jets it is good at staying at max weapons range. If it had another turret for pd up front and some flux and op upgrades i think it'd be on par with more combat focused ships.
The 12 FP (falcon?) cruiser is a little lacking in offensive power. I think giving it the tore up plenty treatment would remedy that.