Thanks so much for checking that out, that's really helpful. I order a lot through Amazon on both my business and personal account with them but I remember once I accidentally ordered something fulfilled by someone else and I had to jump through a few hoops for the return - the fact that Amazon will deal with it is great. Plus the seller is HomeAVDirect whom I think are okay - its not some random seller from China which I had problems with before.The shelf itself will be decoupled from the desk.
Stitch - I've just checked, and if I wanted to send back the white Triangles through Amazon, it is them that handle the return via Hermes pickup (like my sub) so you should be okay. But if you're unsure, then it makes sense to try one of the other colours first. As for amps, how about using one of the small Class D chinese jobbies from SMSL and the like? They're very small and would fit on (or preferably under) the desk without taking up much space.
I have a SMSL AD18 at the moment (from Amazon) and I couldn't figure out if my speakers sound poor because its a poor speaker, or if because of the amp as I dont have another amp to try. But I do seriously wonder if dropping £300 on a second hand Cyrus, or Arcam etc is going to bring a very significant improvement in these speakers, or whether it is more of a speaker issue I am having. Basically, its like someone has thrown a towel over a singers head and they are singing through it (such as Radiohead) when compared with my pair of Sonos Ones.
I might just go completely maverick and get a deeper desk and a hifi rack.