To varying degrees, I use:
asmallorange.com (love and recommend as extremely user-friendly for the less technically-inclined)
mediatemple.com (GS Grid Server and VE Server)
fluidhosting.com (been with them for a few several years, using a variety of their service levels, after staying with them after they acquired a previous host and have only had a great experience).
rackspace.com (i don't recommend them until you hit the enterprise level)
a guy who knows both the lawn business and web strategy