Unfortunatly, not being a
VPS Hosting customer I can't offer such detailed advice but I think you will find what I have to say useful
.
You should expect more from a
VPS Hosting than shared hosting but a lot less than you should expect from a
dedicated server. A
dedicated server has much more resources at your disposal and there all for you - not shared throughout other users.
Also, don't forget that all but one customer could be behaving correctly and the server still go down - all it takes is one wayward script on one account that is malfunctioning or being abusive to bring the entire server down. Basically you have got to be able to trust your neighbours on your server.
Maybe eUKhost will be able to get a group of "trusted"
VPS Hosting customers to go on a server together - that way the effect of abuse would be minimal?
Hope that helps
.