you may want to head to a bike shop to check out some models and sizes, even if you're going to buy used. 105 components are Shimano's mid-level and are pretty solid. Actually they are very solid, just a tad weightier than the nicer more expensive stuff. Even better than that, if the bike has 105 on it it's less likely to be a piece of crap $500-when-new bike. Always welcome to PM me if you have questions.
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"Religion is the one area of our discourse in which it is considered noble to pretend to be certain about things no human being could possibly be certain about"
--Sam Harris
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