do you mean the old battlestar from the 197?/198? series or the modern one form the recent 5 series show. obj or 3ds is probably a good format for you, alternatively a c4d model so you do not have to rerig it. bear in mind that for animation too high a poly count will severely slow the program and it's rendering down. also you may not need to buy one as there are probably soem free ones that you can use for such a purpose if you credit the authors, if you find any download links just try and contact the modeller to ask if use in your project is alright. there are some models on the google 3d warehouse and on foundation3d but firstly they MIGHT not be available for the use you want and the foundation3d ones are great models BUT THEY ARE IN LWO which is beeping hard to export from.
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thanks for your reply and hints!
I meant the new, modern BSG ship from the 2004-09 series.
I will search on the mentioned sites, thanks.
Best regards
SB