oh that sounds amazing.
From what I have read, crafting gear is very high quality and is still relevant even at the high end which helps a lot.
I have watched a bit of twitch and the current end game content and that is definitely too complex to multibox. Hoping most of the dungeons are doable though. There is a poster on the isboxer forums that ran through most of the content up to the high 50's and did a video of each.

I got a new video card but left the rest of my current PC as is and it was tremendous. I only use maybe 50% cpu playing all 4 characters and my gpu sits at 50-60% usage. Prior to the video card upgrade I couldn't load up past 2 clients, or would chop and freeze, the slaves are also running at 30 fps now. It's so nice to play a game with good quality!