hello everyone , first off great site! My girl friend and I have decided to take up biking. We will probably ride at state parks and different areas like that. We are searching for mountain bikes. We definitely have a budget and cheaper is better . But I also want something ok to use. That being said . How much different will a beginner like us notice between a Walmart mongoose or Schwinn vs something from a bike shop. Or should we go used ? We don't need all the fancy stuff like the locking suspension and all that'm. Just two somewhat simple reliable mountain bikes. Under $300 a piece would be good. Thank you guys.