Is your architect also going to be doing the engineer reports and visiting site? We have a separate engineer, so luckily had no extra costs.
One thing to add ( which costs money) is how many copies of your drawings will the architect provide. All depends on how many builders you want to get to quote on the job. Its only a really small thing, but the only thing I hadn't even thought of beforehand.
Also, it would be handy if the architect gave you a soft copy of the cad drawings, so that you could get a friend that knows auto-cad to put in your electrical requirements etc - but most won't do this due to copyright.
Good luck!