[Discuss] Small Linux server recommendation?

[robert at laferla.net (Robert La Ferla)]

I am looking for a hardware recommendation for a Linux server.  Price under $500 ($300 ideal).  It should be small form factor, have 1-2 gigabit ethernet ports (2 is preferred but not required), 8-16GB RAM.  I have a 64GB SATA SSD I can use for it.  The system will run a web server, email, and a Java or Ruby app server.

What should I be looking at?  Shuttle?  Dell?

Thanks in advance,
Robert