I don't think you can do better than these. Keep in mind that the 2900 PowerEdges have been discontinued. These are the replacement models.
I wouldn't go lower than the 610. But, it would fulfill your needs.
http://www.dell.com/us/en/business/...erver-poweredge-t610&s=bsd&cs=04The 710 will allow up to 16 hard drives, which is crazy, allows more memory (but you would never need that much memory). But, it isn't that much more expensive.
http://www.dell.com/us/en/business/...erver-poweredge-t610&s=bsd&cs=04You can get your IT person to look at them. He probably already knows. You simply can't beat Dell (for servers). You can get a great lease, and you can talk them down on the price. The service is phenomenal in my opinion. Make sure you get a 3 year 24/5 warranty, if not better.
