How to retrieve non corrupted back up files and restore to iphone 4

iphone 4 16gb

IOS 5.0.1

iTunes 10.5.3

History:

installed iOS5 back on release date. install was interrupted, likely due to high volumes. Completed install. Initial problem noted: unable to add events to calendar. Then problem progressed to "Voice Memo" app crashing. I installed "Quick Voice" app as an alternative. Problem progressed further to an unexplained increase in "other" content on iphone. Last week I tried syncing my phone and received error message that I didn't have enough space to complete sync. Noted then that "other" content was around 5.4gb! Removed "voice memos" playlist from selected playlists to sync under music tab and noted that other content dropped to 4.5gb

Synced the phone and noticed that it appeared to move through the sync process faster than usual. Sync showed "audio" content and "other" content to be the same size at about 4.5gbs.

After sync was completed I disconnected the phone and looked at the content of my phone. No apps, No music, No photo albums! SMS texts, Notes and Contacts still all intact on phone.

Tried multiple solutions including restore to fix the problem. Each time, when the phone is plugged in and mounted in iTunes, it shows audio content at 4.5gb and other content at 4.5gbs yet the phone itself has no music, no apps and no photo albums. It does still have pictures in "camera roll", though.

After trying many suggested solutions, I gave up and went to Apple store to see the Geniuses (Genii ) They did a firmware update and reset my phone. I was advised to restore from back up. However, when I tried to restore from my back up, it would fail to complete. Unable to restore from back up and sync attempts fail.

The only data I really don't want to lose is my text message history, my notes and my voice files from "Quick Voice" app.

Restoring from back up is not an option since I believe there are corrupt files in the back up. So what I want to know is can I restore my phone as a new phone, and then re-install my text message history, notes and the sound files from the "Quick Voice" app? Perhaps using a 3rd party app to retrieve those particular files from my back up and copy them to the phone directly? Or can I create a new back up file and copy those files to the new back up file. Hopefully I would then be able to restore from the newly created back up successfully since the likely corrupt files will be in the old back up file?

All other information; apps, photos, music and contacts can be re-installed from iTunes.