This depends on what the business is doing and if they have to comply with any Government regulations for [b]Data Security.[/b]
Then you have to take into consideration of just how secure you want your data to be and what size the Budget is. Generally speaking the Best that you can afford is the best option unless there are other factors that have to be taken into account.
Depending on what if any Government Regulations you need to comply with the answer varies. If you don't need to comply with any Regulations the cheapest option might be good enough but it will offer less protection and that may not be something that the company wants. Really without knowing more about your particular situation it's hard to say but what I would recommend is talking to a tech from the company involved if you have settled on this supplier and ask them what would suit your needs best. Avoid the Sales People until you have decided what you require and then just place an order with the Sales Team once you have made your decision.
The smaller units might be OK for your needs but they also might produce a slow down of Mail & Web Access you really need to look at the load that is going to be placed on the appliance before you can make a decision that's why I would ask a Tech from the company first for their advice.
It's better to have more than you currently require than to slow down the system and have people waiting for access to what they need. This also allows room for growth if this is an issue as well.
Col
