I am not familiar with any of the brands but the second bike, the yellow one, appears to have down tube shifters. This would eliminate this bike from my list. If you are not familiar with integrated brakes and shifters, or briefters as they are some times called, they make down tube shifters obsolete.

The most important thing is that that the bike fits you so you really need to get a bike fit before you pick out a bike. It looks like you might be in the UK. If you are, there are a few places I would check on line for bike deals in the UK.

www.probikekit.com

http://www.shinybikes.com/

http://www.totalcycling.com/