macquarie bank recently raised about 500m in rmbs.
from memory it was about 1x oversubscribed and 40bp spread for AAA.
rams is the next one testing the market. i don't think rams will have a problem getting 250m for AAA, especially if the spread is greater than 50bp.
with such a small issue and so much money on the sidelines waiting to be invested, don't be surprised if both volume and price surprise on the upside.