RS are bustable to 100 Mbps, but oversell, meaning it may not always be available. You may only be able to burst up to 5 Mbps at times, depending on the local network traffic.
I believe eServers are burtable to 100 Mbps as well, and they provide a 1:1 bandwidth ratio. Here is a quote from there site:
"Many providers oversell their bandwidth, this means that if all their customers started to use more bandwidth then they would not have the capacity to handle this and as a result your servers would be very difficult and slow to access.
At eServers dot Biz we guarantee that we have a 1:1 contention ratio on bandwidth. This means that we will always have enough bandwidth to service every single customer at their full capacity."
You may want to contact both companies and work it out with them that way.