Alright, looks like the best quality I can stream in real time is 3500 kbit superfast (meaning low workload/low quality), 720p, 60fps. It's not ideal, but to do more I have a feeling I'll need to upgrade both my CPU and my GPU.
But yeah, twitch.tv/gasbandit now fully operational for everyone to ignore
I've got it set to archive my streams automatically, so it should keep them around for a few days after airing (but not forever).
At first I thought "who the hell would ever watch this" but then I tuned it in at work, just to see how the quality was and WHOOPMF half an hour had gone by... so... huh.