Erie Patsellis Offline Upload & Sell: Off
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Were it me, for mission critical storage, I'd look to something that has dual PS, RAID 5 and feed each PS from a separate UPS (fed off each leg of the main supply). Running Linux, should be bulletproof. Depending on your level of knowledge (or a good IT person), it needn't be terribly expensive.
The UPS part is critical, "real" server grade hardware with at least dual supplies fed by individual UPS's mitigates hardware failures. I've found that getting -1 or -2 generation first tier (Compaq, HP, Dell) hardware can be relatively inexpensive. You could certainly get it within your budget, if buying used. If you buy used, find a good reseller and buy at the least a spare power supply, though I'd recommend a complete spare server (less case). The trend in IT circles is ~18 month life cycles, so a 2 gen old machine is at most 3-4 years old. My server has quad Pentium Pro processors, 3 750w power supplies and 3 RAID 5 arrays, and even on this older hardware, is network bandwidth limited. I'm due for an upgrade, and I'll be glad to not hear 21 10,000 RPM drives spinning.
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