What Bike should I look for? 5 miles a day?

Sadly, Schwinn just isn't what it used to be. Two of the three bikes use a cheapo SRAM rear derailleur. The M/B - a bottom end Shimano Tourney. Have you checked out Amazon.com and/or Diamondback bikes? Diamondback Edgewood LX - you'll get 'double-walled' rims, a Shimano Altus rear derailleur, Shimano EF-50 quick fire or easy fire shifters and much more. All for an extra $50.00.