Century makes a pricey thing called Cornerman that'll suspend the bag without having to worry about your foot catching a support strut.
The Top Contender home gym is also expensive, but it'd fit the bill too.
http://www.ringside.com/DETAIL.ASPX?ID=24677
I've been using the cheapy bag stands for about two years though, and I haven't broken a toe yet. I definitely still have that concern floating around in the back of my head, but the bag's projected far enough out that unless you're trying to bury the top of your shin in the bag, the odds don't favor your foot catching the supports. The main problems I run into are the whole mess tends to slide around, and they never give you enough clearance to hang a bag properly (since bag makers tend to assume it's being hung from the ceiling I'm guessing.) on top of that, they're rarely built to handle more than 100lbs.