CAT4
Join Date: Jun 2007
Location: Omaha, Nebraska
Posts: 1,681
Bikes: 2009 Cervélo S1, 2009 Felt F75, 2010 Cannondale Synapse Carbon 5, 2011 Cannondale CAADx, 2011 Specialized Transition Elite
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At your height (which is the same as mine), I would try a 56cm frame. I wouldn't invest anything more into the commuter. I would keep your eyes open on CL or Ebay. Keep in mind though that you will have an expense for tune ups etc. for these bikes too. I have a Jamis Ventura Sport and for the money they are excellent bikes. The one upgrade you may want to do with it in the future is adding a carbon fork. Some other entry level bikes to consider are:
Bianchi Via Nirone 2300
Felt Z100
Scott Speedster S50