ibooks problem with 4.3.2 JB ?

hi im running OS 4.2.1 jailbreaked with pwnagetool with 03.10.01 baseband
the phone is Factory Unlock.
anyway i have a few questions, and i might need some helps from expert here cause i dont want to screw up my phone.

-heres the thing i wanted to upgrade to 4.3.2 cause i want the home sharing feature
so basically my macbookpro and my iphone connected to my home wifi, and i can watch the videos thats are stored on my MBP on the iphone right ?

-anyway i was browsing the net just now and i found out that there are several people that says that the 4.3.2 jailbreak brings back the ibook issues ?
is this true ? cause i need ibook as well.

-and just to make sure , i sync my iphone 4 contact to mobile me and i dont really care about the other thing in my phone , sms, mail, etc . only the contacts that important to me, and as i told you before i already jb my phone on 4.2.1 before and i have installed few cydia app on it.
now i want to start a fresh
so if i upgrade and JB to 4.3.2 using pwnagetool, and chose restore as new phone on i tunes, i will have totally "clean" phone? without all the cydia stuff ?
and after that sync my iphone to my mobileme again to get the contact ?


so sorry if my english is not that good, i hope you guys can get what i mean.
thanks a lot before hand.