The problem is that my client's client (we are a subcontractor in this instance) is demanding it. I've explained that, in real terms, they will get little benef

The problem is that my client's client (we are a subcontractor in this instance) is demanding it. I've explained that, in real terms, they will get little benefit from the large capital expenditure, but it's become a contractual requirement. My current hosting provider are excellent, and we have a > 99.99% uptime with them on this application according to pingdom (and this includes scheduled downtime!) but you know how clients are sometimes!