When we got our dogs, we weren't really given a choice. We had our name down for a Toller pup and he wasn't expected for another year, so we went ahead and got our springer Molly. A few weeks later we had a call from our breeder and 6 weeks later we got our Toller Kimi. It was great having the 2 dogs at such a young age, they learnt from each other and they also became great companions. Then in January'07 we decided to go for dog number 3 and in just over a week we get dog no. 4. People kept telling us we were mad for having 2 puppies at once, but it was the best time ever!!
You do change certain aspects of your day to day life with the more dogs you have, and with dog 3 there were some trying times, but I can't imagine him not being a part of the family.
With dog no 4, my OH took charge, we wanted a rescue cocker but didn't have much luck so he caved-in and we've got Maisy coming to us soon. I'm sure you'll make the right decision for your situation - good luck!!!