For under $700, I'd be patient and start looking for a used gun. You'll be able to find just about any autoloader, in great shape, used for that price.
I prefer the AL391, 390, or 3901 because they FIT me the best. They have a longer Length of Pull than most other autoloaders, and have an adjustable shim system.
At the end of the day, fit is more important than brand. In fact, FIT is the most important thing - period. So if you want a particular gun and it does not fit, find a good gunsmith to adjust the stock for you. That's what I have to do with 870's. No sense in having any gun that you cannot shoot well -- it will just lead to frustration.
Last edited by wolverine72; 08-05-2009 at 07:21 PM.