I would say 2 girls are the better option for a new owner because there is less likely to be fighting. The person I got mine from had 12 girls in a big run on the grass the other day, with no fights! I cant get 3 boys to live together, but I have always done well with 2 boys. At the moment I have 4 young boys(2 lots of 2) and 1 old girl left(her friend died) Obviously there is a difference now, but there wasnt much from them being the same age, I dunno if anyone else has found that girls can be a but scattier, but nothing major.
As for the cats, make sure the cage is locked so they can't get to them and they should be fine with them.

*Heidi*

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