Under dash heat/ac

Hey all, looking for some advice... I've been looking for an under dash a/c / heat kit for my Ram and was wondering if anybody had any recommendations. I came across a few different kits...found this one for $600:http://www.southernrods.com/categories/heating-and-cooling/heating-and-cooling-systems/products/product-7.htmlIf anybody has had any experience with any these or any insight, please let me know.Thanks!