I would tend to stay away from any hosts that don't own their own datacenter and servers.

You can always run a whois or a reverse IP on any hosts to see where their datacenter is.

As for specific hosts...I don't know of many since I've either hosted dedicated or run my own server (doing both at the moment), but a friend of mine is getting shared hosting on www.liquidweb.com and I have nothing but great things to say about their service quality and support. They are a bit more expensive than other hosts though.