Mel so darn sorry to hear what you've been going through. Re the LIT question, you may not need it with a different partner; remember it's to do with antibodies within you against your partner (or his sperm, actually :) ).
Personally I don't feel you're being selfish at all, but I do feel your DH is. Perhaps his diagnosis has got him worried, but he should be thinking how you're feeling too. It's never good to give someone a 'me or xx' ultimatum, and worse so when it's someone who supposedly loves you. I'd suggest you need to sit down with DH and have a long talk, calm if possible, to find out where his reaction has come from and for him to realise just how much this means to you - gives you a chance to find out just how much you, in turn, mean to him?
I would say - and I'm not in any way suggesting you aren't going to be doing this with DH!! - that you don't necessarily need a partner to have a baby, so don't worry about that; donor sperm is just fine, and there are several single ladies on the FF Serum forums who are going it alone (including twin mummies). So don't let that be a pressure for you.
With the missing receptor I assume that yes, you'd still need neupogen, but you'd obviously need to take advice on that from your clinic (I'm not sure if you're planning on Serum?).
nanny May's not that long away, and it's always good to have a plan!
Hope all is well with everyone else? /wave