Wow, thank you all for your thoughtful replies. I'm much more comfortable with the way I'm leaning atm then.
Nai: Was it you who posted your DH's journal on his V? I am planning on showing that to DH.
Trill: I think depending on the type of TL you have it can be done as day surgery now, but it depends. Laparotomy requires a couple of nights in hospital but there's no way I'd undergo that. I would want laparoscopy. It's still more invasive than a V though.
Rory: As Nai said, I have read there is no evidence that V alters hormone production or sex drive. Testes still work the same way, just the sperm can't leave them and so are therefore reabsorbed into the body.
mbear: I heard that too - just for the first couple. Even so, it's a definite argument against!
LIG: I have heard this too. I asked about it at my 6 week check with the GP when she was questioning us about contraception. She said most specialists are reluctant to see you until your youngest is 12mo. For the SIDS reason and also to give you that year to make sure you don't want any more.

Again, thanks to you all.