Are you looking to move all of your clients or just the one art site?

I'd be careful looking at anyone that offers 'unlimited' traffic, i'd recommend you find someone that offers a decent allowance and a cheaper overages.
£40 for 8GB over is very expensive - The servers we have are given a traffic allowance of 1TB, anything over this is charged to us at £29 per 1TB of traffic..

What other requirements do you have as far as the number of domains hosted, disk space etc.

control panel for transfer is going to be a large consideration. These guys are good. not cheap but good. Reseller / Multiple Domain Accounts | Clook Internet

Thanks Dan

I'm just looking to change the one site. If I change the others I have to sort out new email/login settings for everyone which would be a pain.

I also need ODBC functionality and ASP Upload

1TB = 100GB ?

My current disk quota reads 97/500mb

Hope that helps!

1tb = 1000 Gb