The problem with cheapy bikes is the hubs & BB. They need to be overhauled more often and are damaged more easily. see parktools.com for details.
When you buy one you might educate yourself about wheels. Look over eBay and other sites for used wheels with high quality hubs.
The fenders on the first bike do not seem like they will work
2000 Montague CX, I do not recommend it, but still ride it.
Strida 3, I recommend it for rides < 10mi wo steep hills.
2006 Rowbike 720 Sport, I recommend it as an exercise bike.
1996 Birdy, Recommend.
Wieleder CARiBIKE (folding), decent frame.