If you can get both, why not?  Food, vet costs, etc. will obviously be double, but my vet gives me a "group rate" when I take more than one at a time...the office visit charge may be a single charge even if double charges for actual shots, meds, etc.  One of the greatest things, though, about having two is that loneliness issues will be considerably less or non-existant since they will have each other as well as you to cuddle up with, play with, etc.  Potty training, too...if one "gets it" quicker than the other, the one who 'gets it' first will help train the other.  Finally, if you are in such a quandry over which to choose...and obviously want the boy but not give up the girl...getting both will allow you to 
never suffer from the "I wish I" or "I should have" or "why didn't I" syndrome!  Oh, and you will probably never have to wash your face again...unless you just want to!  
