Hi Lee,
Firstly, I can only echo all the praise and positive things that have already been said – I am extremely impressed that this site is still up and running and looking so good, given the minuscule resources behind it. Very well done!
As for the question, I would vote for Option Bi-annual draw, and although I love the prize draw, I mostly use the page for the manuals and the ability to ask questions in the forum on all matters related to B&O.