Hi,
I cannot recommend a NUC for this usage for a number of reasons:
1. No storage, internal support of 2.5" or external drives only which means
that you have to choose between a hotter NUC (sits right on the CPU) or a 
slower OS.
2. Small fanless form factor means a very hot PC and the CPU and memory in use
are the Low Power models. The CPU in particular costs ~100$ more in comparison
with a none LP CPU with the same speed (also some LP CPU models come with no
virtualization support).
3. No expansion slots. Its impossible to later add a 2nd physical NIC.
As for the DELL optiflex, those are amazing but the models with i5 and 8GB RAM
start at ~700$. 
For myself, I have recently built an almost inaudible PC, with an i5 and 8GB
RAM after spending a lot of time in 
silentpcreview.com, if you want to I can
share my build. Changing my SSD with a 1TB HDD and no GPU its about 500$.
On Tue, Dec 02, 2014 at 10:39:03AM -0500, Dave Neary wrote:
 Hi,
 
 I'm looking for ideas of mini PCs I can use for a small RDO cloud -
 looking at maybe 3 shuttle PCs, each with "enough" disk (maybe 800GB
 total storage) and RAM (8GB per PC enough?). Also, I'm wondering if 2
 NICs is reasonable to ask for. My desired price point is *low* - all 3
 for under $1000 would be ideal, failing that, as close to it as possible.
 
 Anyone have recommendations for hardware that would serve this process?
 
 Thanks,
 Dave.
 
 -- 
 Dave Neary - NFV/SDN Community Strategy
 Open Source and Standards, Red Hat - 
http://community.redhat.com
 Ph: +1-978-399-2182 / Cell: +1-978-799-3338
 
 _______________________________________________
 Rdo-list mailing list
 Rdo-list(a)redhat.com
 
https://www.redhat.com/mailman/listinfo/rdo-list ---end quoted text---
-- 
Best Regards,
 
   Amit.