In no particular order:
Sentinels and rough riders do, indeed, have only 20cm move and with Infiltrators they're pretty fast. Boarboyz, on the other hand, do have a 25cm move (and infiltrators to boot!).
20cm move. On its own, this isn't too hot an idea - it seems like the worst of all possible worlds. Just fast enough to prevent the formation from garrisoning but really not fast enough to keep up with a rhino-mounted formation.
Infiltrator. This could perhaps work. It would make it faster, certainly. However, it's somewhat limited in a mixed formation - the Defiler will slow down the formation significantly, while it won't be able to make full use of its full charge move even when moving with rhinos. I'm a bit scared of defilers that can ignore ZOC when charging, however!
Scout. Gets around the issue of not being able to garrison, but I don't really see what impact this will have on the role of defilers - they will be limited to garrisoning formations, but then they tend to just be used to garrison anyway.
Personally, I'm still for Speed 25cm. While I think this might be a little generous based on the 40K rules, it will make the Defiler fulfil the role it should - scuttling death machine supporting CSM formations. If it is any less, it just won't see any more use on the tabletop.
Reaper autocannon. I'm not fussed, but I suspect the twin-las was there to give a little more AT oomph, something that seems to be a little limited in the CSM list.
2x close combat arm attacks. This is a possibility, but with two MW attacks that's a scary beastie! Defilers really aren't much better than Dreadnoughts (actually, thinking about it, they actually aren't better than Chaos Dreadnoughts in 40K), I think giving the thing 3 CC attacks is too much. A boost to CC3+ seems less problematic. And, as Tiny-tim pointed out, the way you've written it is confusing - if we were going for three attacks, this would be the way to do it: Battle claws / (base contact) / Assault Weapon / MW, Extra attacks (+2)
Armour value: I'd be happy to go for an Invulnerable Save rather than 5+RA. Just be aware that against conventional weaponry this way makes them tougher, while the 5+RA only makes them tougher against MW.
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