I have to agree with everyone on what you can afford, love & care for. If you are looking for a stud you want to evaluate your females and find the stud that is going to compliment and improve any of their faults to keep improving the breed. You will have to have that critical eye and it is hard for us sometimes as are babies are beautiful to us. If you can find a stud that can improve on both of your females faults keeping the lines in mind there should be no need for two, unless you are planning to hold back from your own breedings.
With a stud be prepared to have belly bands, to save your home...
