A couple of new iPhone rumors suggest Apple could be looking to release both high-end and low-end models this year, while the iPhone 5 remains in the middle. Analyst Peter Misek has suggested that the iPhone 5S will go through preliminary builds in March, with a launch in June or July, less than a year after the iPhone 5 debuted. Originating from Asian part suppliers, a second report claims that a recently rumored lower-cost iPhone could include a…