i think you'll find with rapid progressive sperm count as low as it is, IUI would have negligible value for you - the chances aren't that great that it will work even with a good SA result (they're significantly less than with IVF), so i'd think you'll be steered toward IVF

having said that, IVF doesn't have to involve icsi - because the egg and sperm are put in close proximity, the ability of the sperm to swim won't be a problem. what they'll look at is whether there are unusual deformities to the shape of the sperm that may prevent them being able to penetrate the outer shell of the egg. you might have an FS that prefers to use ICSI due to the higher fertilisation rates, particularly if you don't get a high egg count at epu

FWIW, my hubby has a good SA, with all his results being within the normal range, so we're able to try IUI (and have had two chemical pg's from IUI) - but when we next do IVF (later this year if we don't get a sticky IUI pg before then) we'll use icsi as our fertilisation rates in the lab weren't that great.