Coming from me, I don't think another ham will be too much trouble
(Its when you get to my stage that you start saying that
) The only thing you have to consider is vets bills, but if you have savings aside its fine.
Even if your OH doesn't love hamsters as much as you, I'm sure he understands that they are very important to you.
I had to get another syrian even though I felt the household was full, they are very different to dwarfs in my opinion. So I understand completely
Its a great valentines present idea too x