Oh i'm sorry i didn't mean to make you think i was talking msu i despise msu unless you playing under 1000 points maybe 1250 at max. but for your list what i mean was moving towards unit sizes closer to 7-8. You're at most losing 2-3 guys from your list but those points can be spent on additional bodies elsewhere or even another unit of bikes. that was where i was leaning towards. while i understand the bike squad at 3 i just don't know how effective they will be unless you can almost guarantee you're going 2nd and even then i just worry that your opponents will squish them well before that turn.
And ya playing nids won't really help you tell what your list needs tweak wise. would say one of the best armies i think to try your luck against would be dark eldar. my reason is this. Dark eldar are the perect spoiler army in 6th edition. their abilities and play style are just not duplicated via any other army. i believe if you make a list that can deal with dark eldar and still beat nids then you should easily have a list that can compete with everythign from GK to orks to other eldar and flavors of sm.