Of course you could always get a toilet with a pump in it, which blasts that stuff down the drain. They are quite a bit more expensive, but solves the problem of pooer flush. This was the other solution the plumber had for me. The first (a $3 stopper), was a much better one, IMO
http://www2.kohlerco.com/plumbing/detail.asp?item=9876&prod_num=3437
http://www2.kohlerco.com/plumbing/detail.asp?item=9876&prod_num=3437