Dumb question I know, but I don't want to be taken to the cleaners. I want something around $200-300 and am getting advice from coworkers and such. This weekend I am going to get fitted for one (I am 6'4). I just know of a few brands and was told that Shimano parts are really good. Also, been thinking of getting one on Ebay used or new, but want to know what to look out for. This will mainly be for trail riding and riding around downtown areas and parks and such, so no serious off roading. Any advice from any one greatly appreciated. Thanks in advanced.(bike)