Imagine-
My hubby is a semiprofessional photographer (sports stuff, if you could call it that; he shoots paintball!) Anyway, just have to ask the obligatory photographer question: What camera does hubby use?
Mine is a Nikon person and currently has the D80 although he'd buy the D300 (or something??) if we didn't just have a baby seven months ago!
That's quite an age range w/ your kids. I am 12 years younger than my sister and 14 years younger than my brother, too.

Your twin boys are lucky in a way... their older siblings can spoil them.