We were essentially in the same position as you this time last year. With our weim we took her to Southside Dog Obedience Club down at Runcorn (we are from the tarragindi / holland park west area). http://www.southsideobedience.webs.com
Their price is cheap. something like $10 per year for membership and $5 per lesson.
I think it all depends on which instructors you get but we are very happy with the progress of our not so little anymore weim at southside. Just remember to do your homework and that weims like to walk the fine line between doing what they want and doing what you want.