xbt is an excellent tracker. Olaf also has a mod to integrate it with vbulletin, but it is not free. We are running it, and it is good.
For your new servers, make sure you have an additional gigabit network interface on both servers, separate from the internet interface. Connect the two servers by a cross cable across the gigabit interface. This is essential. If this is not done, you will derive no benefit from having two servers. In fact, you will have even more problems. Most hosts will not charge you anything extra for this, and even if they do, it will a nominal charge for the additional hardware. The traffic between your own servers will not be added to bandwidth consumed.
You do not need 2000GB transfer on the database server. You will only need a small amount for maintenance access and backups.
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