I've never been to Nepal, but I am planning on going next year, and after consultation with my brother (who has been quite a few times) we've decided to do something similar to you, including flying to Lukla, hiring a porter and going to Gokyo and then the Cho La pass.
My brother's thoughts were very similar to Al and Mowglee
> ...your guide will almost certainly have the latest news on accomodation [sic] en route ...
> ...even if the tea houses are full, they won't turn you away - you might just end up sleeping in the dining room.
The porters phone ahead to book rooms for their clients so the independent traveller can arrive to find there are no rooms left and they are sleeping in the dining room.
My brother has not been since the earthquake and I would be interested to hear your experiences when you return.
Have a good trip.