just a suggestion, but in the past i've used port 14330 (1433 x 10)
and also on my current dev machine, that has every version as an instance,
they use ports 12005 for SQL 2005, 12008 for SQL 2008 (my R2 is the defailt instance) and 12012 for my SQL 2012.
just saying, it made sense at the time.
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