I've been with ServInt for only a month, but so far, the experience has been great. I originally grabbed a VPS from LiquidWeb after hearing some good things on forums, but was terribly disappointed. The loadtimes I was getting were awful. Though I will say that their customer service was pretty sharp. Anyways, I think you'd be making a good move by going with ServInt. So far, the performance has been wonderful, haven't really had to deal with their CS yet though. As far as unmanaged goes, I've heard Slicehost and Linode are winning that race. My 2 cents.
