i think it all depends on your life. if you want to potty train and teach commands to two at the same time and have enough patience to work them both together and seperatly to be good canine citizens then i say go for it...if you don't have the time and energy to put into them both equally and don't think you can handle two, then wait a little longer.
good luck either way and i hope to hear from you and see pics of the new one if you decide to get her....
remember to get them both spayed and neutered so no ooooppppsss happens!!