I've had it for 6 days now, have 8 more left on J&R's return period and can't decide if I want to trade up for the Marantz 5400 or not. I don't have any huge complaints about the 601 but couldn't honestly say that I'm bowled over by its music SQ, and from what I keep hearing, the 5400 is supposedly much better for people like me who listen to music more often than movies. Now, bear in mind that the Mordaunt Short speakers I have hooked up to the receiver (MS05) are not exactly audiophile quality, so how much of a difference do you think I would *really* hear with the 5400? It sounds like most people who own the Marantz also own speakers that are at least one or two price levels above mine. To further complicate things, it now looks like hifi.com is out of stock of the 5400, their site says "ships in 2-3 weeks." Argh! So my question is, should I really bother, or just stick with what I have? Would a non-audiophile like myself, with non-audiophile speakers, really be able to hear much of a difference to justify the $150 price jump (not to mention having to ship the Onkyo back on my own dime)?