I have a Rocketfish Mini DisplayPort to HDMI adapter I bought from Best Buy. Picked it up on a whim when there was a pricing error early last year for $3, and it's worked very well for me.
Everything has so far worked fine with the dock expect two issues.
1. I have the turn off display set to 5 minutes. When that happens, the monitor turns off, then immediately turns on and shows the "no signal" message, turns off, shows "no signal" and keeps on repeating. This is a short recording of the issue: hereI.
2. Monitor flashes randomly just for a second probably once or twice in an hour.