I know what you want; but don't know if you'll ever find one that completely
satisfies your specifications as many of them are contradictory:

>  We are looking for bags that are good from say 30 degrees and up,
> lightweight, roomey, NOT mummy style, has to roll up relatively small and
be
> able to fit into fairly small stuff sack say about 13" X 22" or
thereabouts.

Roomy & not mummy style for two people is unlikely to fit into 13 x 22...
unless you go with expensive down ... but that would likely be more
expensive than you want to pay and I would not classify down as washable (it
is; but it is also a pain to wash... should be washed by hand... and should
be line dried)

> Would prefer cotton inside

cotton make more bulk...
but you can buy cotton liners separately....

Perhaps you could buy a down comforter on sale... (probably no sale until
spring)... fold it double and sew a long side/bottom zipper into it... and
use a cotton liner... but this baby may still not stuff to the size you want
it to... but if anything will it would be down with a nylon cover... the
cotton liner could be washed as often as you like and the down maybe once a
year...

Good Luck,

Bill