Big Paws Only Dog Forums

OK, as you all know I am new here and I won my first Mastiff Homer.  I am not new to big dogs though.  Used to have Newfies but they always lived outside.  Homer is a inside boy!  I have said since day one....if he continued to be this good next spring we might get a female.  Well...I have had a lady contact me locally ( 2hrs away) who has two 5 month old girls left that have not sold.  She said she is reducing them only to good approved homes for $250 each.  They were $1000.00. I am like WOW!  Thats a great price and parents are nice and OFA certified ect ect.  Thing is...Homer is 4.5months old.  He is my dog.  Follows me everywhere and is sooooo laid back.  I can not ask for a better pup.  If I bring in another one now basically same age as him....do I lose our bond?  Will he start to follow her and not me so much and I can see him being more active due to play.  I figure its best to wait till spring when they can romp outside and he is older and our bond is more established.  But, I hate to pass up this quality of a OEM at this price!  Any suggestions? I don;t want to lose what Homer and I have and my mom and hubby both say it will change him and they will prefer each other more than me.