I have the MT-9180 tripod and I bought it from B&H in October 2004 for $160. It does a good job and can easily handle an RB67/metered prism/180mm lens. I've also used it with my Canon EOS 3 and a 500mm/4.5 lens and it was solid. Basically its a decent tripod at a good price.
Searching my way to perplexion
I have the MT-9170 tripod with one of the medium sized ballheads (MH-1001?). It does a great job with my RB67, which is my heaviest camera. I've done long exposures in all terrains and never had any stability problems. Giottos gets a "thumbs up" from me.