I've been looking for a decent accelerator for my A500 for ages. I'd love to have one of the Viper 520s or better yet the 530s, but they seem to be like gold dust. Accelerators in general seem to go for ridiculous prices - you'd be looking at at least 50GBP (about 75 Euro) for an 030 like GVPs A530 :-o
We should get a consortium together to ask DCE to do another run of the Viper 530. I'd definitely buy one. or two!