I think you need to split this up a bit to make it easier to do price shopping.
1. 2 dedicated servers, 1 Windows 1 Unix, with Plesk licenses and 32 IPs for each. 1TB RAID1 or RAID10 (trust us, you really want this) storage; 8GB RAM or more (I think 8GB will be enough for what you are talking about).
2. Someone to assist in managing your Plesk install. This does not have to be the same company that sells you the dedicated servers - they should take care of power, network, hardware, software licenses.
There are other companies that will manage your Plesk for you for a set price per month - check reviews of those services here on WHT. Probably for a negotiated fee, they will assist in migration of accounts to Plesk.
This way, you can more easily focus on finding first, the best place to get your dedicated server and then, the best people to remotely login and help you manage the setup.