I have loved many cats and dogs but like you pointed out there are several that have been my soul-mate babies. The great news is that your heart is a muscle and can make room for others, try not falling in love while watching the antics of a silly kitten.
Personally I think that all good cat Moms owe it to the world to have as many as they can financially afford to care for but then again that might just be the excuse I use for having so many.