Archonis

I have been a fellow MD owner for about 2 years now ... I have had an MZ-N510 for those two years, and it served me quite well, except for some minor problems. Now I have seen how competitive the market has gotten, and I wish to get something with higher capacity. I wasn't sure if I should go for Hi-MD, but after looking at the RH910, I am almost sold on it. My question is, is it worth if for me to move up to the RH910? I will be listening to mostly MP3's on the 910, as converting to ATRAC is a hassle for me, and most of my songs are MP3 anyways. Just wondering will the sound quality of MP3 on the 910 be worse than ATRAC on my 510? And what about the general construction and durability of the 910? Is it a fragile unit? I know it's thinner than my 510, which I like, and that it has a digital amp as well as the equalizer, which my 510 doesn't have. I also know I will have less battery life on the 910 than on my 510. Lastly, what about the jog dial ... is it designed for long durable use, will it hold up as well as my 510 in general, and how comfortable/convenient is the jog dial? It seems that since it's 5 way, it's easy to do something you did not want to do. Any added thoughts and opinions would be appreciated.