I had decent experience with an IBM reseller, back in 2005 or so. I forget the exact term. VAR? Solutions provider? Anyway, we were able to get the latest POWER system (POWER 6, I think) and evaluate our AIX-based app on it for about 2 weeks. They even set us up with a small SAN! Unfortunately, the reseller was not terribly skilled technically, so they were unable to configure the SAN. I had to figure that out myself.