wingnut771, the star rating on all IS accounts work pretty much the same. The only difference is, is how fast the stars go down per gig you download on the account. Think of it as a multiplier. The less you pay for the account, the the higher this multiplier is, to faster mark you as a heavy users, which means it takes less gigs to get into 1 star.
That said, pretty much all IS accounts are unshaped after hours, which is great on all of them, so as long as you don't need the account during business hours, the cheaper accounts are just as good as the more expensive ones. If you need business hours dsl, go for the more expensive business classified accounts, where the stars fall much much slower.
As for Openweb accounts, they do say they don't make use of the star rating system, however in truth they are bound to that exact same system. What you will find however is, their gold accounts are the more expensive accounts, and usually that ISP have the heavy downloaders, who won't really complain about day time shaping on 1 star, because they pretty much know how much they download is abusive.