I have a LEM #8 575 watt, and it works well. I have used to grind up deer meat (60-80 lbs at a time), and also to make sausage in batches up to around 30 lb batches. This thing will take anything I put it through.
I believe the post above regarding the LEM #8 is probably the #8 big bite grinder, which has a larger throat to it, which makes it easier for grinding for a 2nd grind. I believe you can get the 575 watt for around $120 new, and the Big Bite is around $280 or so.
If you are just planning on doing small batches, 20 lbs or less, and don't plan to use it all the time, the #8 575 watt should be plenty, however the Big Bite seems like it would have some added convenience if you had the extra cash to spend.