Cincy_Bob and I are in agreement about the Lamm, and I think Jtinn's description is pretty much spot on. The Lamm is a special piece, but it does only have 57db of gain and loads the cartridge at 40 ohms, so make sure your Shelter has enough output for your usual listening levels. The Lamm also is perhaps a little "rounded" or soft in the highest frequencies, so if you're looking for the last word in razor sharp highs you might be disappointed; I myself, as a classical music fan, find this a good thing. The Lamm works well with my very low output Koetsu Rosewood Signature Platinum, but on some records cut at low levels I could use a little more gain (for those I switch to the MC stage of my JP200, which gives overall about 100db of gain, including the line stage), so check the output of your Shelter before deciding.