if you get the denon and dont like it, you will still be able to swop it for one of the others, as long as you have the receipt and return it in original condition
... it's consumer law ... if there is no time specified for returns, I think there is a 28 day period in which to get a refund or swop (assuming you live in the EU/UK)
Pioneer SA-9800 amp
Marantz CD-63 mkII K1 signature
B&W DM2 speakers (1st version transmissions)
Silver High Breed Coherence LE interconnect