I can't believe there's actually a discussion about the cost of amps as measured by weight or watts per dollar. To my mind, how affordable is it for how it SOUNDS is paramount, with how it looks a distant second. That sound and what is "affordable" for one person or another is so varied and subjective that all of it is an individual rationalization. Weight and cost per watt has never been on the radar for me.
KEF R500, R200C, R100, SVS SB2000 sub, NAD T758 receiver, Pro-Ject RPM1 TT w/ Ortofon 2M Red, Bluesound Vault2, Sony BDP-S480 BlueRay player, Samsung UN55JU6500F 4K LED TV, KEF M500 headphones, Sony CDP-CE500 CD changer.