CHK THIS OUT...! ...take a moment and look at the progression of the production of the iPod...
Models
ModelGenerationImageCapacityChanges introducedConnectionOriginal release dateLaunch price (
US$)iPodfirst

5, 10 GBFirst model, with mechanical scroll wheel.
FireWire23 October 2001$399, $499second

10, 20 GB
Touch-sensitive wheel. FireWire port had a cover. Hold switch revised.
FireWire
17 July 2002$399, $499third10, 15, 20, 30, 40 GBCentral row of touch-sensitive buttons. Dock Connector port introduced. New backlit touch-sensitive buttons introduced.
FireWire
(USB for syncing only)28 April 2003$299, $399, $499fourth
(photo)
20, 30, 40, 60 GBButtons integrated to form "Click Wheel". Color display with photo viewer introduced in October 2004. It replaced the monochrome model in June 2005.
FireWire or
USB19 July 2004$299, $349, $399, $449
fifth (video)

30, 60, 80 GBSlimmer design, introduced in white and black variants. Larger screen with video player and lyrics support. No
AC adapter, Universal Dock, or A/V cables included. The September 2006 revision (often called generation 5.5) featured a brighter display, longer video battery life, and a music search function. The 60GB model was upgraded to 80 GB.
USB
(FireWire for charging only)12 October 2005$299, $399
what you notice about ipod you will notice about the iphone...the progression of look and storage medium...the iphone has both a 4GB and 8GB...the progression of storage medium only get bigger...and noticed that the price value stayed consistant...so i wouldn't doubt if the price of the iphone will stay just as consistant