I like industrial, something that will last decades and never wear out. Bought my 58mm tamper from Vaneli's for about $35 and shipping. Is one piece stainless and weighs over 20 oz. Just like this one...
Solid Stainless Steel Tamper
For use with my Cremina lever at home I had one of those double enders not being used, it's 55mm on one end and 50mm on the other. I needed something around 49mm~ so I hand sanded it to fit my Cremina double basket like a glove and works great. A good 49.5mm tamper specifically for the Cremina basket is quite expensive...