Regency or Quadrafire Insert and size?

I am looking to install a new insert for a stone masonry chimney in a 1600 sq ft log cabin (open floor plan). A local shop is having a closeout on 2007 models Regency I2400 and I3100 and Quadrafire 3100i and 5100i.

I know these are both good brands. The Quadrafire would cost me about $100 more than the Regency. I like the fact that Quadrafire has a variable speed blower as opposed to the 2 speed Regency blowers.

Any thoughts on these two brands.

Also, should I go ahead and splurge for the larger model for longer burn times. You can always crank down the heat but you can only get so much heat out a the medium size models. This will be my primary source of heat. Or are those two big for my 1600 sq ft cabin?

Thanks.

Also, is this a good liner to install

http://www.chimneylinerdepot.com/store/comersus_listCategoriesAndProducts.asp?idCategory=54

or should I go with something a little stouter. The chimney shop will only install their products and the liner, insulation, and accessories they quoted was $922 for materials. He showed me the pipe and it is very stout.

I went with the Regency 3100 thanks to the folks at Black Mtn Stove (Jack). I hope to install it next week.