Check out
www.ironhorsebikes.com Mason, Iron Horse have employed Dave Weagle, the engineer behind Evil/E.13 (which any good canadian should know about) to design the suspension on the higher end bikes this year and by all accounts they ride like a dream. The bikes are, according to some message boards, getting pretty hard to pick up in the U.S. now, suggesting that the first production run for the year is almost sold out over there which should be some indication of how popular / good the bikes are.
Word also has it that Rocky Mountain are planning to phase out the RM series some time in the next 12 months, for the reasons stated above and because the swingarms break, a lot. Wade Simmons and the rest of the RM freeriders are apparantley going to have a lot of input into its' replacement, so the new bike should be something pretty special.
For now I say go with the Iron Horse, they're bikes are an awesome deal for the price and they're not messing around with their push to be a serious DH bike manufacturer.