A good quality private switch is better because you can set up two networks on it, one public, one private LAN for off server backups. Any backups going out over the public side will accrue bandwidth charges. A switch that can sense and shut down a broadcast storm which might be brewing up and is recommended. We've had good experience with these: http://www.newegg.com/Product/Produc...82E16833129055
The switch would only be an extra $10/month (I presume per server) which isn't too bad. We are still looking into a few other solutions, but using a private switch and using it for both an internal vpn and backups would be great.
WHSuite - Billing, Automation and Client Management Software.
not sure how layeredtech does things, but if they allow you to aggregate bandwidth (by only counting the uplink bw of your switch), then its definitely worth it since as mentioned above, you can save a lot of bw for server to server traffic (sql, etc). also if they support vrrp/hsrp and allow you to hae 2 drops from different equipment, you can have redundant lines for a peace of mind.