I understand I should get a bigger size but my current two options are to either keep the 54 Specialized or get the bigger Phocus 1600 bike. I know the Specialized Allez is a better bike but do I keep the better bike if it's a tad smaller or do I get the bigger Walmart bike? Those are my only two options right now. If I'm comfortable on the 54, are there any negative physical affects with keeping that size?