An HP ML 330 G6 would be a decent starting point. Minimal CPU (eg. a base 4 core Xeon) and 4 GB of RAM is all you need, you can plow the rest of your funds into redundant power supplies, hot-spare disk, battery backed RAID controller, and a backup solution.
The ML330 has room for 8 LFF SATA or SAS drives plus an internal LTO tape drive. The base server is quite affordable; you're going to be spending all your money on disk and the tape drive. It's not going to run anywhere near 25k like the poster above suggested.
That's all the advice you get for free though.
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-Scott
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