Thanks for the suggestion.
Actually, before buying I had auditioned Grado MS2 and Ergo Model 2 (driven by DV332/w stock tubes); HD650 and AKG 701 (driven by Lisa3). At the time, I was only able to use my iPod Nano3g as a source.
MS2 was ridiculously bright with DV332, and I'm not a fan of bright phones, so MS2 was out of my list. Ergo 2's sound was very close to those of 650, but I found 650 was more "fun" to listen to.
Unfortunately, the shop where I auditioned 650 and 701 didn't have DV, so I had to use Lisa to drive them instead (the shop also carried Tomahawk and Hornet, and I tried them all and found that Lisa3 was superior to those amps). 701, to me, sounded too distance and sometimes its treble can hurt my ears (note that I don't know how good is the synergy between Lisa3 and 701), whilst 650 sounded more weighty and more dynamic. Considering the kind of music I'm listen to (Jazz, Acoustic, Blues and Country), I picked 650.
The reason I bought DV332 was because it's said that DV332 + HD650 was a match made in heaven and I thought that at the moment with that amount of money, I couldn't find any better amp for my phones.
That said, after many hours of serious and analytical audition, I started to doubt if the sound I listened was the sound of Sennheiser's flagship phones driven by one of the amp said to be its best match.
Honestly, I'm really new to the headphone world and have no idea about how much I can expect from a good set of headphones. IMO my Totem Rainmaker driven by NAD C372 can deliver far better sonic experience.
Again, I'm sorry if my long; off-topic post upset someone.
P.s. A pair of (bloody expensive) Lm Ericsson 403Bs is on its way. I will see if it can make me love this set.