So the FS wants to collect and prepare the best of DH's sperm for IUI? Sounds like something you could try for a while as you appear all clear. Sometimes people jump too quickly to IVF IMO - best done with good advice from a FS and discussing all the options with them (including financial implications).
Like with natural pg, it can take a while to fall pg with IUI so you may want to discuss how many goes you would be willing to try before discussing the next step more seriously.
There is a BB member who tried IUI, then IVF, then on her 7th IUI (between IVF cycles) fell pg.