I don't think you can really go wrong with paradigms, whatever model you buy, as they are usually a good value at all price points of their product line. No idea what the retail on this model is, but maybe you can check ebay to see how much these are going for used. I say if it is a good deal, go listen and if you like em', go for it!
edit: just from the specs looks like they don't go too low, of course you are never going to get tons of low end from any bookshelf. Just something to keep in mind if you like to thump the house.