Yeah, i've had HD6870 Toxic. It was fast, almost as fast as HD6950, no denying that, but the damn thing was deafeningly loud and as soon as i dropped the fan speed, it got so hot it often locked up.
Changed it for HD6950 TwinFrozr III and couldn't be any happier. It's fast, good quality, cool and silent. It needed some fan tweaking as well but it's now silent and doesn't overheat.
RejZoR's Little Secrets @ rejzor dot tk