the BHG gunship is fine, except for its star wars origin. - i don t consider it too strong, but thats just me. - however, flames and nasty comments left and right will lower your fun, and in the gunship, you ll get them, even if they re unjust or just, who knows.
the orca, never had one. - i thought its only the front gun that isn t working properly. - ( i am one of those that unmounts front guns and replaces them with other guns - but i read in frozens trial thread that "there are jerks who even unmount front guns in favour for fighter missiles" - dang, i gotto say to myself, i must be one of them... ( allthough i never had any missile turrets on my kusari GB when i replaced the front gun - but since i and you don t wanne be jerks, ... i guess there s no go:)[ there is an advantage ... a GB front gun has a limited fire arc, when replaced with a fighter gun, that one gun has a full 360 degree arc ] - but jerk, none the less )
the liberty GB "should" work. firstly, its produced in such large numbers that it shouldn t be a problem, secondly, - in theory, the BHG has a very good understanding of the liberty house and so has liberty with the BHG. - reality is different though. - so you gotto decide what you like to prefer... the game lore, or the player opinions.
bretonian/kuari GB won t work. - that is just me though, cause both factions are at war and will not sell them to someone that "may" work for the side that pays him more. a BHG is not an uncertainty factor like a common merc, but he is still not the army.
rheinland GB, - basicly its OK to get it. the BHG has no problems with rheinland, never had.. but thats again only NPC game lore. - again, reality looks vastly different and you won t get one.
IMG gunboat - while i believe it might be OK to buy one.... IMG is a cooperation and very much after making money. BHGs are quite unlikely to attack the IMG, cause its against their lawful codex, too. so if the representitive faction says "ok" - its fine. the IMG gunboat is good at strafing from a distance, but otherwise pretty big - a well balanced ship.
edit: since BHG and order are at a very same war as bretonia and kusari, i m allways surprised to see non BHGs in their ships, too... .
so, from my point of view. - the best choice is either orca or IMG GB, closely followed by the liberty GB. for all the rest, you re bound to present us a thrilling story - preferably not about theft:P.
edit 2: i dont like the argument that "in 4.85 its being fixed" too much. - we don t even have a date for the update yet ( unless i missed it ) - so i think its still quite some time to go.