Heat-sink as add-on?

[jhgoodwin]

Until the heatsink options are available, I was considering buying some approx 9x9x for the USB chip:
http://www.ebay.com/itm/20pcs-Aluminum-H...1879440839

Then, for the RAM/CPU, I was thinking something like this might be nicer than lots of smaller heatsinks:
http://www.ebay.com/itm/1Pcs-50mm-x-48mm...1058620079

My goal is to use ~20 of the 2GB versions as a spark/hadoop cluster.

When I get done assembling them, I wanted to put them in either a single, or modular case to tidy it up, plus help direct airflow with a few fans.

For the HDFS, I also was planning on getting some higher performance microsdxc modules, with specs like this or better:
http://www.amazon.com/PNY-Turbo-Performa...B00W77C1QU

Thoughts?

References:
http://wiki.pine64.org/images/2/2e/Pine6...atsink.png
http://files.linuxgizmos.com/hardkernel_...detail.jpg