Hi,
Not many clients just yet - so I haven't thought it necessary to invest in my own hardware at the moment. Instead when given the freedom to choose who the client host's with or if I am asked for a recommendation I have always forwarded them to 1and1. Not only does this help if I am asked for any help, as I have a lot of experience working with them ( I have hosted with them for a few years) but they also have a very tempting affiliate programme. It is definitely worth a look at. You loose nothing and chances are you will gain something.
Hope this has helped,