Lastly it needs to be priced right.
Of course I can appreciate the need to find something within your budget, but you're not helping matters by not telling us your budget. How much are you willing to spend?
I used a neoware thin client, just ebay pfsense, or m0n0wall, and they can be had for less than 100USD. I gambled, and bought mine for 12USD, and got bit as it has no PCI riser, I ended up just using vlan tagging to do all my interfaces on one.
completely silent, 2 leds, and little heat. Uses 21 watts idle.