Or carry a snatch block. And I've always read 1.5 times vehicle weight. Remember you're not lifting the vehicle up a wall (usually). It's a rolling weight pull most of the time. My HS9500 has pulled my 5500 lb YJ up a few steep inclines no problem.
I agree... sort of
A good snatch block and knowing how to use a winch properly will get you out of most situations if you have a running engine and power still.
However, if you can afford a 12k... you will be bettering your odds of a clean extraction when you really
really need it. The low profile winches are great for mounting to a transportable receiver hitch mount. FWIW, I have enjoyed Warns customer service and products, I have no personal experience with Ramsey.
Now, one more thing to consider is if you are not planning on using one often, then I think I would go for the one that costs a little less and still has a reputation for quality, regardless of the "brand."
One thing I am sure I would advise you in a portable winch is synthetic cable, the weight difference between steel cable and the synthetic stuff is enough benifit alone to use it! It also floats, doesn't kink, is field repairable quickly, and is much safer to work around. Its a no brainer and worth the extra $$$ in my opinion.