Would I be correct in assuming you only loaded one bio file to your x-chip? If you did just go to the usual places download the M8 bios(use the correct version for your xbox) and throw them in one of the other three spots on your chip. This will give you the chance to try out other bios without removing what you know already works. You would simply hold down the corosponding button on your controler to load the other bios files. If you edit your m8 bios with a bios editor make sure you put in the correct path for your dashboard to load(in evtool).
As far as features.... what features. Fan speed, led colors? I have two dashboards I love. Evox and Unleash. Evox is pretty basic and has little or no customizeable options but of all the dashboards this is the most reliable. Unleash on the other hand has tons of stuff. Led colors, fan speeds, screen savers, motion desktops. If your looking for features. I'd just use Unleash. It will do all your looking for and alot more. M8 can be configured to boot to any dashboard of your choice. You have to edit your bios path to ensure you get the correct file(dashboard) to boot. If you need help feel free to look me up on msn messenger. My computer is always on.